Climate
Why Humid Heat Is Becoming India’s Most Dangerous Climate Threat
From menopausal women and taxi drivers to surfing instructors, rising humidity is making heat harder to escape—even indoors.
Humid Heat in India is emerging as a growing public health threat. Through data, expert insights and lived experiences from across the country, EdPublica explores how rising heat and humidity are making everyday life increasingly difficult for millions of Indians.
By 9 a.m., Radha, a 55-year-old office worker from Kottayam in the southern Indian state of Kerala, is already drenched in sweat as she waits for her bus. By noon, waves of heat, anxiety and discomfort begin to set in. Menopause had already brought frequent hot flashes, she says, but rising temperatures and humidity have made them harder to endure.
For Radha, relief no longer comes easily. Even routine tasks feel more exhausting than they once did. Her experience reflects a growing reality across India and much of the world: climate change is not only making the planet hotter, it is making heat harder for the human body to bear.
Humid Heat in India Taking a Growing Toll
When high temperatures combine with high humidity, the body struggles to cool itself through sweating, its primary cooling mechanism. As moisture in the air increases, sweat evaporates less efficiently, causing heat to build up inside the body.
A recent analysis by Climate Central found that dangerous humid heat days have more than doubled globally since the 1970s. The average number of dangerous humid heat days has risen from around 10 days per year to 23 days annually.
Alarmingly, climate change is now responsible for nearly two-thirds of these dangerous humid heat days. The consequences are increasingly visible. A study examining mortality linked to extreme heat events since 2000 estimates that more than 260,000 people have died from heat-related hazards worldwide.
Globally, climate change is now responsible for six times as many dangerous humid heat days each year as it was in the 1970s, underscoring how rapidly the risk has intensified. In 2025 alone, the world experienced an average of 23 dangerous humid heat days. Climate Central estimates that 19 of those days, or 83 percent, were added by human-caused climate change.
“These findings show how profoundly climate change is reshaping our world,” said Kaitlyn Trudeau, Applied Climate Scientist at Climate Central. “Dangerous humid heat has gone from being an uncommon event to a defining feature of daily life in some regions, pushing conditions closer to the limits of what the human body can safely endure.” Climate Central’s analysis of 961 cities worldwide found that 69 percent, or 665 cities, are now experiencing significantly more dangerous humid heat days because of climate change. On average, these cities recorded 46 additional dangerous humid heat days each year during the last decade compared with a world without human-caused warming.
Researchers say the findings highlight how climate change is evolving from an environmental concern into a growing public health emergency, particularly in regions already struggling with heat exposure, limited access to cooling and inadequate health infrastructure.
What Is Humid Heat?
Scientists often use “wet-bulb temperature” to measure humid heat. The metric combines air temperature and humidity to estimate how effectively the human body can cool itself through sweating.
Climate Central defines wet-bulb temperatures of 25°C or higher as dangerous humid heat conditions. When humidity and temperature combine to push wet-bulb temperatures upward, the body’s natural cooling system becomes less effective.
In extreme conditions, the body can no longer regulate its temperature adequately, increasing the risk of heat exhaustion, heat stroke and even death.
Older adults, children, pregnant women and people with pre-existing health conditions face the greatest risks. High humidity can worsen cardiovascular stress, respiratory illnesses and other heat-related health complications.
“Dangerous humid heat has more than doubled since the 1970s. We’re already seeing the consequences play out in real time,” said Lisa Patel, Clinical Associate Professor of Pediatrics at Stanford Children’s Health and Executive Director of the Medical Society Consortium on Climate and Health.
“As a pediatrician, these numbers are a wake-up call. This kind of data is exactly the tool clinicians and public health officials need to anticipate where heat-related illness will strike and who is most at risk before people end up in the emergency room.”
How Humid Heat Is Affecting India
Humid Heat in India is already becoming visible in several cities, particularly along the country’s southern and eastern coasts.
According to Climate Central’s analysis, Tamil Nadu emerges as India’s most affected state. Tirunelveli experiences an average of 273 dangerous humid heat days annually, the highest among Indian cities. Chennai follows with 257 days, while Tiruchirappalli records 251. Vijayawada and Visakhapatnam in Andhra Pradesh, along with Kolkata and Mumbai, are also among India’s humid-heat hotspots.
The danger does not end when people move indoors.
A separate study by Climate Trends found that heat exposure frequently continues inside homes. Researchers monitored temperatures and humidity in 50 low- and middle-income households in Chennai between October 2025 and April 2026 and found that indoor temperatures regularly exceeded 32°C.
Some households experienced more than 5,700 hours above this threshold—equivalent to nearly eight months of continuous heat exposure. Most households recorded between 3,000 and 5,000 hours of such conditions.
The findings suggest that for many urban residents, especially those without access to air conditioning, relief from heat remains elusive even indoors.
Heat, Menopause and Everyday Life
For women such as Radha, humid heat can intensify already challenging health conditions.
The World Health Organization notes that hot flushes and night sweats are among the most common symptoms associated with menopause. These episodes involve sudden sensations of heat in the face, neck and chest, often accompanied by sweating, flushing, palpitations and discomfort.
Women who have undergone hysterectomy are known to experience more frequent and severe hot flushes. According to NFHS-5 data, nearly one in ten women aged 30 to 49 in some regions of India have undergone the procedure.
As temperatures and humidity rise, these symptoms can become even more difficult to manage, adding another layer to the health impacts of climate change that often goes overlooked.
A City Struggling to Cool Down
In Mumbai, 59-year-old driver Vikas says heat has become one of the city’s biggest challenges.
Water shortages are becoming more common, and even routine outdoor work is growing increasingly difficult.
“Sometimes people go to the beach at night just to find some relief from the heat. Even a brief spell of rain feels like a blessing now,” he says. “The problem is only going to get worse.”

His observations echo broader climate trends in the Mumbai Metropolitan Region. Climate Central’s analysis shows that Mumbai experiences an average of 206 dangerous humid heat days annually, while nearby Dombivli and Thane record even higher numbers. The conditions he describes are reflected in current forecasts. Climate Central projected a daily high wet-bulb temperature of 25.6°C in Mumbai on June 23, a level considered dangerous humid heat.
Surfing Through a Hotter Coastline
Further south, the effects are also being felt along India’s coast.
Rajaguru, a surfing instructor in Puducherry, says summers are arriving earlier than before, often beginning in February instead of March.
“We go surfing early in the morning, but even then the heat feels much more intense than it used to,” he says. “Sunburns and skin rashes are becoming common. Summer arrives with extreme heat, while the monsoon season increasingly brings cyclones.”
He has also noticed rising sea temperatures and changes in water conditions that affect both tourism and outdoor activities.
For people whose livelihoods depend on spending long hours outdoors, humid heat is becoming more than an inconvenience—it is becoming an occupational hazard.
The Vulnerability Gap
These experiences reflect a larger challenge facing India. The impacts of Humid Heat in India are magnified by inequalities in access to cooling, housing and reliable electricity.
Between 1995 and 2024, the country experienced 430 extreme weather events, resulting in more than 80,000 deaths and economic losses exceeding USD 170 billion. Rapid urbanisation has intensified the urban heat island effect, making cities significantly hotter than surrounding rural areas.
The latest Climate Change in the Indian Mind survey found that 84 percent of Indians report experiencing the effects of global warming. Yet only 15 percent of households own an air conditioner and 27 percent have access to an air cooler.
Even for those with cooling systems, reliable electricity is not guaranteed. Around 66 percent of Indians experience power disruptions on a typical day, even as demand surges during heatwaves. On May 21, 2026, India’s peak electricity consumption reached a record 270 gigawatts.
Despite being the world’s third-largest emitter of carbon dioxide, India’s per-capita emissions remain relatively low, reflecting deep inequalities in energy consumption and access.
For millions of people, escaping extreme heat is simply not an option.
When the Air Stops Offering Relief
Dangerous Humid Heat in India is already reshaping how people live, work and survive. As temperatures and humidity continue to rise, the boundary between uncomfortable and life-threatening conditions is becoming increasingly thin.
For millions of Indians, the challenge is no longer adapting to hotter days. It is adapting to air that no longer offers relief. As humidity rises alongside temperatures, surviving heat may become as much about access to cooling and electricity as it is about climate itself.
The future of climate adaptation may begin not in policy documents or air-conditioned offices, but in homes, buses, streets and workplaces where the heat is already impossible to ignore.
Climate
Every Rumble Sounds Like the Mountain Falling Again: Inside Meppadi’s Second Landslide in Two Years
A community that survived one of India’s deadliest landslides is still relearning how to live with the sound of the hills coming down.
On July 7, 2026, around 11 a.m., a rumble echoed through Meppadi and a six-year-old boy ran. He had stayed home from school that day. The moment he heard the sound, he rushed to his mother, wrapped his arms around her, and refused to let go. He was trembling. For him, the sound wasn’t just noise. It was 2024 again.
The boy had survived the Chooralmala landslide that killed hundreds of his neighbours two years ago, and he has been in counselling ever since. On this day, a new landslide six kilometres away, at the Anakkompoyil–Meenakshi tunnel construction site in Kalladi, had reopened the wound.
“For him, it was like reliving the 2024 landslide,” his grandmother, Roshna Yusaf, a social worker and former Meppadi panchayat member, told EdPublica. “The moment he heard the familiar sound again, he came running and held on to his mother. He refused to stay apart.”
Meppadi is a small hill town in Wayanad, a hilly district in the southern Indian state of Kerala, set in the Western Ghats — a steep, rain-soaked mountain range that runs down India’s western coast and is globally recognised as one of the world’s biodiversity hotspots. It was here, in July 2024, that a series of landslides buried the neighbouring villages of Mundakkai and Chooralmala, killing hundreds of people in one of the deadliest disasters in Kerala’s history. Two years on, Meppadi panchayat — the local administrative area that includes both those villages, Kalladi, and the town itself — is still rebuilding. In July 2026, it happened again.
The Kalladi landslide killed eight people — seven migrant workers and the project’s construction manager — in a disaster that geo-scientists have since called preventable, pointing to inadequate geological and hydrological study for a tunnel driven through fragile Western Ghats terrain. Rescue operations ran for six days before all the bodies were recovered. Around 40 families from nearby Meenakshi were moved to relief camps.
For Meppadi, still rebuilding after the 2024 Chooralmala–Mundakkai disaster, it was not an isolated accident. It was a second interruption to childhoods, livelihoods, and a fragile sense of security the community had spent two years trying to rebuild.
When Childhood Is Interrupted
The six-year-old is one of many children in Meppadi still carrying the trauma of repeated landslides. For them, the sound of heavy rain or collapsing earth is enough to bring back memories they have spent months trying to overcome.
The latest disaster has again disrupted their education.
“It has been only one month since schools reopened. Now the children cannot go to school,” said Biji Zhacahi, a mother of two from Meenakshi.
“Every year, it is the children’s future that gets disrupted. Because of these repeated incidents, some children even become reluctant to go to school. As parents, we are always worried about their safety.”
Roshna pointed out how narrowly the community escaped a far larger tragedy. The Kalladi landslide struck at 11 a.m. — a school day, but after the morning rush.
“If the landslide had happened in the morning, many students could have lost their lives, because they usually board their school buses from the nearby bus stop,” she said.

For many families, interrupted schooling — and the fear of sending children to school at all — has become another fixture of every monsoon.
Women Living in Uncertainty
Repeated landslides have also reshaped daily life for women, many of whom manage households alone while their husbands work abroad.
“Women here have forgotten how to smile,” Roshna said. Years of facing one disaster after another, she said, have left many women emotionally exhausted.
“Every time it rains heavily, the same questions come back — what if another landslide happens, where do we run, how do we protect our children? The fear never really leaves.”
When Livelihoods Depend on the Weather
The uncertainty extends well beyond the home. It touches almost every livelihood in Meppadi.
“When it rains, it rains continuously for several days,” said Krishna Raj, a shop owner in Meppadi town. “Transportation becomes difficult. We have to travel to nearby towns to bring supplies for our shops, but during heavy rain that is not always possible.”
With roads frequently cut off, even running a small business becomes a gamble.
For jeep driver Mansoor Ali, every journey through the hills carries its own anxiety.
“It is very scary to drive here at night,” he said. “Whenever I hear a loud sound, I fear it is another landslide. In the dark, we don’t even know where to run. That is how most drivers here live.”
Many residents had already shifted from agriculture to tourism after repeated crop losses from wild animal attacks made farming increasingly difficult. Landslides, and the restrictions on tourist movement that follow them, have now unsettled that livelihood too.
“People moved to tourism because farming became difficult,” said Sijo, who works in the sector. “Now tourist visits and homestays have also been affected.”
For many families in Meppadi, there is no livelihood the monsoon has left untouched.
A Tunnel That Brings Hope — and Questions
Despite the tragedy at the construction site, residents largely continue to support the Anakkompoyil–Meenakshi (Kalladi–Meppadi) tunnel project. The twin-tunnel road is meant to cut straight through the hills separating hilly, landlocked Wayanad from the neighbouring coastal district of Malappuram, replacing the long, congested detour drivers currently take over the Thamarassery Ghat — a winding mountain pass notorious for accidents and traffic jams.
“We have great expectations from this project,” said Nishal, a resident of Meenakshi. “Better connectivity is something people here have needed for years.” At the same time, he added, residents are uneasy about how the construction is being carried out.
Roshna fears that soil excavated from the tunnel is being dumped on the slopes above her home. “If more soil is dumped above the mountain, many houses, including mine, could be affected,” she said. “I am 56 years old. I cannot build another house.”
Her fear echoes the explanation Kerala’s government has itself offered for the disaster: a state minister called it not a natural landslide but a man-made one, a clear case of lapse, and said the district collector had warned the tunnel’s contractor, Konkan Railway, in writing about the danger — a warning that went unheeded. Following the incident, the Kerala government suspended all construction on the Rs 2,134-crore tunnel project pending two separate investigations.
Nishal recalled that a strong artesian spring had emerged during the tunnel’s initial construction phase the previous summer. A paddy field near the site had also been cleared and filled in by the construction company, he said, and inadequate drainage afterward let water and loosened soil flow downhill. Many residents, he added, still don’t know whether they will eventually be displaced, because the project’s final alignment has never been clearly communicated to them.
“People have doubts because they don’t have clear information,” he said. “But almost everyone supports the project because we need better connectivity.”
The tension between that need and its risks is not new. A legal challenge to the tunnel had argued that it cut through an ecologically fragile region already prone to repeated landslides, and that environmental safeguards were inadequate. In April 2026, the Supreme Court declined to halt construction, calling the project one of significant public importance and leaving compliance to statutory regulators. The court settled the legal question. The Kalladi landslide reopened the scientific one.
A Disaster With a Familiar Shape
The parallels to 2024 are not just emotional; they are geological. Both disasters struck the same short stretch of hill country in Meppadi panchayat, where a thick layer of weathered, unconsolidated lateritic soil sits over highly fractured bedrock — a combination that loses its shear strength rapidly once intense rainfall raises pore-water pressure inside the slope. Researchers who studied the 2024 disaster concluded that this fragile geology, not any single cause, was what turned extreme rain into a catastrophic slope failure, and warned that the region’s concave slopes, which concentrate runoff, remain especially susceptible to future failures.
The 2024 Chooralmala–Mundakkai landslide remains one of the deadliest in Kerala’s history. Official confirmed deaths stood at 231 for months, before the state government declared all 32 people still listed as missing to be dead, in a notification issued on February 10, 2025 — a bureaucratic closing of the books that, for families, only formalised a grief they had already been living with. Independent researchers, using different counting methods, have since put the true toll considerably higher.
For Meppadi, that history is why an eight-death landslide at a tunnel site feels less like a new disaster than a recurrence — proof that a community built on some of the most landslide-prone slopes in the Western Ghats has yet to find a way to build, or to grieve, that outlasts the next monsoon.
A Town That Never Stops Recovering
For Meppadi, the latest landslide is not an isolated tragedy. It is another interruption in a recovery that never seems to end.
Children grow up carrying trauma. Women wait anxiously through every spell of rain. Workers wonder whether their livelihoods will survive another monsoon.
Yet amid the uncertainty, residents say it is the community’s solidarity that helps them move forward.
“From the NDRF and Fire and Rescue teams to local people, everyone stands together with one heart to rebuild the area,” said Meppadi Grama Panchayat President Ramla Hamza. “The resilience of the people, even after facing repeated disasters, makes these difficult times a little easier to bear.”
The rescue teams have left, and the roads will eventually reopen.
But in Meppadi, the true cost of living is not measured only in damaged homes or lost income. It is measured in a community forced to begin recovering all over again, every time the hills give way.
Ground report from Meppadi, Wayanad, Kerala, India. Some names of residents quoted appear as given to our reporter in the field.
Climate
From Lost Wages to Rising Medical Bills: How Extreme Heat Is Already Costing India’s Economy
India’s scorching summer may have ended with the arrival of the southwest monsoon, but the economic impact of months of extreme heat is only beginning to surface. The costs are visible at every level—from workers earning less because they cannot stay on the job, to households paying more for healthcare and cooling, and ultimately to the country’s economy losing billions in productivity.
New report by Adelphi Global argues that this “double burden” of falling incomes and rising medical expenses is one of the least recognized economic consequences of climate change. In a country where nearly nine out of ten workers are employed in the informal sector and households continue to shoulder a large share of healthcare costs, the financial consequences are particularly severe.
When Heat Cuts Working Hours, Incomes Fall
Extreme heat affects the economy first through labour. Unlike machines, people cannot continue working safely under prolonged exposure to high temperatures. Workers slow down, take frequent breaks or stop working altogether to avoid heat stress. Recovery from heat-related illnesses can take weeks, while severe cases may permanently reduce a person’s ability to work.

The impact is greatest in agriculture and construction, where work is physically demanding and carried out outdoors. According to the report, India already loses an average of 4.31% of annual working hours because of this. Under a moderate warming scenario, that could rise to 5.8% by 2030. In agriculture and construction, annual working-hour losses are projected to reach 9.04%, equivalent to nearly 22.5 working days each year.
For millions of workers paid by the day, fewer hours on the job mean less money taken home.
Informal Workers With Little Financial Protection
The losses are particularly severe because most Indian workers lack social protection. The report estimates that 90% of women workers and 86% of men work in the informal economy, where paid leave, health insurance and wage protection are rare. Missing work because of extreme heat often means losing income immediately.
Median daily earnings remain modest even before these disruptions. Women earn about USD 18.72 (PPP) per day, while men earn around USD 25.52 (PPP). Repeated income losses can quickly push vulnerable households deeper into financial distress.
The report warns that between 54% and 80% of informal workers globally already earn below median wages. In India, where nearly one-fourth of the population lives below the World Bank’s lower-middle-income poverty line, recurring heat-related work losses could push even more families into poverty.
Rising Temperatures Raising Household Expenses
The financial impact does not stop when workers leave the job site. Heat-related illnesses increase medical spending at a time when incomes are already falling. Although public spending on healthcare has increased, households still pay 44% of India’s total health expenditure directly from their own pockets.
Annual per capita out-of-pocket health expenditure reached USD 151 (PPP) in 2023—almost three times higher than in 2000. Extreme heat also raises everyday living costs.
Keeping homes cool becomes more expensive during hotter months. While wealthier households spend only around 0.2–0.25% of their total expenditure on air-conditioning, the poorest households may spend up to 8% of their household budget on electricity for cooling. Researchers describe this growing financial burden as “heat poverty”—where families struggle to afford adequate cooling despite rising temperatures.
Due to this, food prices are also expected to rise. Higher temperatures alone could increase global headline inflation by up to 1.18% and food inflation by as much as 3.23% by 2035. Together, these costs create a financial squeeze: households earn less while spending more.
The Bigger Economic Picture
The report argues that these household-level losses eventually add up to a national economic challenge. According to Lancet Countdown, India lost about USD 194 billion in potential income because of reduced labour capacity caused by extreme heat in 2024. That is equivalent to roughly 5% of the country’s GDP.
Globally, the economic impact is equally significant. Between 1981 and 2010, heat exposure resulted in the equivalent loss of 35 million full-time jobs and reduced global GDP by an estimated USD 280 billion. Between 1992 and 2013, climate-driven extreme heat caused economic losses estimated at USD 16–50 trillion worldwide.
The findings show that extreme heat is no longer only an environmental or public health concern. It is becoming a growing economic challenge, particularly for labour-intensive economies like India.
Rising Heat: Need for Economic Policy
Adapting to extreme heat requires more than emergency weather advisories.
It calls for stronger labour protections, income support for workers affected by heat, expanded social protection for informal workers and greater public investment in healthcare to reduce dependence on out-of-pocket spending. It also recommends increasing adaptation finance to address productivity losses and the economic consequences of heat-related illnesses.
As climate change makes India’s summers hotter and longer, the true cost of extreme heat will be reflected in shrinking pay packets, rising household expenses and slower economic growth.
Climate
Wayanad Landslide Death Toll Rises to Five; Search Continues for Missing Workers
The death toll in the landslide that struck a tunnel construction site at Kalladi near Meppadi in Kerala’s Wayanad district has risen to five, with rescue teams recovering two more bodies from the debris today. Search operations are continuing to locate the remaining missing workers amid challenging weather conditions and unstable slopes.
The landslide occurred on 7 July after heavy monsoon rain triggered a slope failure at the construction site of the Anakkampoyil–Kalladi–Meppadi tunnel road project. According to officials, around 18 workers were present at the site when the hillside gave way, burying workers, machinery and temporary site facilities. Nine workers were rescued with injuries and shifted to nearby hospitals, while emergency teams continue to search for those still trapped.
Wayanad Landslide: Rescue operation enters critical phase
Personnel from the National Disaster Response Force (NDRF), Kerala Fire and Rescue Services, Police and other emergency agencies are leading the rescue effort. Teams are focusing on identified high-probability zones using earth-moving equipment and sniffer dogs, but intermittent rainfall and unstable debris continue to slow the operation. Authorities have also evacuated nearby areas as a precaution against further slope failures.
Questions raised over construction practices
The incident has renewed concerns over infrastructure development in the ecologically sensitive Western Ghats. The Kerala government has ordered an inquiry into the landslide, including whether excavation activities or the dumping of excavated earth from the tunnel project contributed to the slope collapse. The construction company has denied the allegations, maintaining that the landslide originated from a natural hillside above the project site.
The latest tragedy comes less than two years after the Mundakkai–Chooralmala landslides of July 2024, Kerala’s deadliest landslide disaster. The recurrence of landslides in the Meppadi region has intensified calls for stricter geological assessments, improved monitoring of infrastructure projects, and stronger safeguards for workers and communities living in landslide-prone areas.
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