Why Is This Hot Weather Hitting India So Hard?
Let's be honest. India has always been hot. But what is happening right now is not your usual "summer is here, drink some nimbu pani" situation. This is something far more serious, and pretending otherwise would be doing everyone a disservice.
The 2025 India heat wave arrived earlier than the typical May to June summer season and placed hundreds of millions of civilians under extreme thermal stress, creating widespread health concerns and agricultural disruptions across the country.
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The India Meteorological Department was already sending heatwave alerts by the end of March 2025. That is not normal. That is your calendar being wrong about the season.
2024 was the hottest year ever recorded in India and globally, with temperatures rising more than 1 degree Celsius above normal in several Indian states. And 2025 did not back down from that record either. India recorded its eighth warmest year on record in 2025, and ten of India's fifteen warmest years since 1901 have all happened between 2011 and 2025.
So this is not a one year fluke. This is a pattern, and it is accelerating.
The causes are well established. Rapid urbanization, deforestation, rising greenhouse gas emissions, shrinking water bodies, and most importantly, the urban heat island effect are all working together like a perfect storm that nobody wants to be invited to.
What Exactly Is the Urban Heat Island Effect, and Why Should You Care?
Here is the part that gets overlooked in most conversations. People think heat comes only from the sun. That is partially true. But in Indian cities, a huge chunk of the problem is human made.
Cities contain large areas of concrete, asphalt, and buildings that absorb and retain heat, while having less vegetation and moisture to provide natural cooling. In contrast, surrounding rural areas often have more vegetation that cools the land through a process called evapotranspiration.
This creates what scientists call the urban heat island effect, where the city itself becomes a heat trap. The ground heats up, the buildings absorb heat, and instead of releasing it, they bake you overnight too.
As concrete and heat radiating structures like glass and metal replace original land cover, cities experience warmer days and nights. This increases the temperature of the ground, roadways, and buildings, referred to as the land surface temperature, and leads to a growing heat island crisis in our cities.
Cities like Delhi, Ahmedabad, Nagpur, and Hyderabad regularly record summer temperatures above 45 degrees Celsius. The urban heat island effect makes these cities several degrees hotter than surrounding rural areas, turning heatwaves into public health emergencies.
And the poorest residents always pay the heaviest price. Low income households battle heatwaves the hardest, living in densely packed neighbourhoods with single room tenements, houses without proper ventilation or cooling methods, and children without open spaces or parks.
Surface temperatures in these areas are dangerously high and rising every year. Urban planners keep approving concrete jungles. Trees keep disappearing. And millions of people are left to figure it out themselves.
Does Extreme Heat Affect India's Ecosystem Too?
Yes, and this part matters more than most people realize.
When you think about heat stress, you probably picture a human sweating on a rooftop. But ecosystems experience heat stress too, and the damage is wide, deep, and long lasting.
Extreme heat disrupts food production. It speeds up bacterial growth in food and water. A warmer climate creates favourable conditions for bacterial growth, triggering diseases like diarrhoea, cholera, infective gastroenteritis, dysentery, and malnutrition that spread further due to shortages of clean drinking water.
Crops fail when surface temperatures spike beyond what plants can handle. Farmers lose entire seasons. And this does not just affect the farmer standing in the field. It affects the prices you pay at the market.
Wildlife also suffers. Higher temperatures alter migration patterns, disrupt breeding cycles, and reduce biodiversity in regions already under pressure from habitat destruction. Coral reefs near Indian coastlines bleach under thermal stress. Groundwater evaporates faster. Rivers run lower. The ecosystem does not get a heat action plan. It just absorbs heat silently until the damage becomes irreversible.
Has India Seen This Kind of Heat Before?
Short answer: yes, but not quite like this.
India has a long history of brutal summers. The 1998 Odisha heatwave killed over 2,500 people. The 2010 Ahmedabad heatwave was so devastating it led to the creation of India's first ever heat action plan. A 2019 heatwave killed at least 215 people in Bihar alone.
But the frequency and intensity of these events is increasing rapidly. Climate scientists identified India as particularly vulnerable to thermal extremes, with projections suggesting that by mid century, parts of India could be among the first global regions to experience temperatures exceeding human survivability thresholds.
February 2025 was the hottest February on record nationally, with an average temperature anomaly of plus 1.36 degrees Celsius. Goa and Maharashtra even experienced India's first heatwave of the year on February 25, which was an unprecedented event for the winter season as defined by the IMD.
So yes, India has seen heat before. But it used to arrive in May or June. Now it shows up in February, like an uninvited guest who keeps arriving earlier every year and refuses to leave.
Are People Dying from This? Here Is the Brutal Truth
This is where things get uncomfortable, and important.
On average, more than 1,000 Indians die every year due to heat waves. A single day of heat wave across the country can result in an estimated 3,400 deaths. Since 1990, one quarter of all global heat wave related excess deaths have occurred in India.
Let that number sit for a moment. One quarter of the world's heat deaths. In one country.
And the real numbers are likely far higher than what gets reported officially. Public health experts say the true number of heat related deaths is likely in the thousands, but because heat is often not listed as the cause on death certificates, many heat deaths never get counted in official figures.
Former WHO chief scientist Soumya Swaminathan has consistently warned that India's official figures represent only the tip of the iceberg. The extreme summer of 2025 saw temperatures in parts of Rajasthan reach 48 degrees Celsius, and even historically less vulnerable regions like Assam and the Himalayan states reported fatalities.
According to one study, about 70 percent of Indians could be exposed to a wet bulb temperature of 32 degrees Celsius or more by the end of this century. In that scenario, about 2 percent of the population, tens of millions of people, could breach the 35 degree wet bulb threshold, which is almost certainly fatal.
The heat is not just making people uncomfortable. It is killing them. And heat stress on vulnerable populations like outdoor workers, the elderly, pregnant women, and children in low income areas is already a daily crisis during summer months.
About 75 percent of India's workforce is exposed to heat at work, and 34 million job losses are projected due to heat stress by 2030 according to the World Bank.
What Is Coming Next, and What Should You Expect?
The meteorological agencies predicted the abnormal heat would persist longer than typical seasonal patterns, and the India Meteorological Department warned citizens to prepare for an above normal number of heatwave days.
About 57 percent of Indian districts, home to over three quarters of the population, are now classified as being at high to very high risk from extreme heat, according to a 2025 report by the Council on Energy, Environment and Water.
The situation in Indian cities is worsening every decade. Urban migration keeps pushing more people into heat trap zones. Green spaces are shrinking. The infrastructure in most cities was simply not built for temperatures this extreme.
Mean urban land surface temperatures are projected to rise by an additional 45 percent compared to surrounding rural areas. That means the asphalt you walk on, the buildings you live in, and the air you breathe in cities will keep getting hotter unless something changes structurally.
Important Safety Measures You Must Follow Right Now
This section is not just filler. These steps can genuinely save your life or the life of someone near you.
Stay hydrated, even when you are not thirsty. Your body starts losing water before thirst kicks in. Drink water consistently throughout the day.
Avoid going outside between 11 AM and 3 PM. Surface temperatures peak during these hours. Even a few minutes of exposure in direct sunlight can trigger heat stress.
Wear light coloured, loose cotton clothing. Dark colours absorb heat. Tight fabric traps it. Light and breathable clothing keeps your body cooler.
Cover your head when going outdoors. A cloth, hat, or umbrella creates a personal shade barrier and significantly reduces heat absorption on your scalp.
Know the signs of heatstroke. These include confusion, no sweating despite the heat, rapid heartbeat, nausea, and loss of consciousness. This is a medical emergency. Call for help immediately.
Check on your elderly neighbors and family members. They often do not recognize when they are overheating, and they live alone in homes without cooling.
Carry Oral Rehydration Solution (ORS). Salts and electrolytes matter as much as water during extreme heat. ORS helps your body retain what it loses.
Never leave children or pets in a parked vehicle. Car interiors can reach deadly surface temperatures within minutes under direct sunlight.
Use wet cloths or cool water on your neck, wrists, and forehead. These are pulse points where cooling has the fastest effect on your core body temperature.
What Needs to Change at a Bigger Level
India needs to move beyond emergency mode and into prevention mode. India's first heat action plan for Ahmedabad, developed in 2013, helped reduce fatalities during heatwaves by up to 40 percent. But replicating this nationally has been difficult due to fragmented data and a lack of systematic death reporting.
Green and blue infrastructure, including urban forests, wetlands, green walls, and restored water bodies, can lower local temperatures by 2 to 5 degrees Celsius. This kind of investment helps reduce heat stress, improves air quality, and builds long term resilience against intensifying climate change.
Trees are not decoration. Water bodies are not wasteland. They are survival infrastructure.
Frequently Asked Questions (FAQs)
Q1: What temperature qualifies as a heatwave in India? According to the India Meteorological Department, a heatwave is declared when the maximum temperature of a plain area reaches 40 degrees Celsius or above, with a deviation of at least 4.5 degrees Celsius from normal. For severe heatwaves, the deviation must be 6.4 degrees Celsius or more.
Q2: Which Indian cities face the highest risk from extreme heat? Cities like Delhi, Ahmedabad, Nagpur, Hyderabad, Patna, and Jaipur face some of the highest urban heat island effect intensity in India. Smaller tier 2 cities like Jamshedpur, Raipur, and Indore also rank high in heat risk due to rapid, unplanned urbanization.
Q3: How does the urban heat island effect make things worse? Urban surfaces absorb heat through concrete, asphalt, and glass structures throughout the day. Unlike vegetated land, they do not cool down efficiently at night. This keeps Indian cities several degrees hotter than surrounding rural areas, extending the risk window for heat stress well into the night.
Q4: Can extreme heat in India kill you in a short time? Yes. A wet bulb temperature above 35 degrees Celsius is considered almost certainly fatal even for a healthy person resting in the shade. India's combination of high temperatures and rising humidity makes this threshold reachable in certain regions, especially during peak summer months.
Q5: What should I do if someone around me shows signs of heatstroke? Move the person to a cool, shaded area immediately. Apply cool water to their skin, especially the neck, underarms, and groin. Do not give them food or water if they are unconscious. Call emergency services without delay. Heatstroke is a medical emergency, not something to treat at home.
Q6: Is India doing enough to address this crisis? Currently, the response is uneven. Some cities have heat action plans in place. However, there is no comprehensive national system for tracking heat related deaths, limited funds for long term adaptation, and an urgent need for better urban planning, tree cover restoration, and occupational protections for outdoor workers.
Additonal Things :
While you work make sure to carry a cold water bottle with you avoid using plastic water bottle and if possible take frequent cool shelters to stay safe.
Sources: India Meteorological Department (IMD), Council on Energy Environment and Water (CEEW), Bloomberg Heat Crisis Report, PBS NewsHour, Wikipedia 2025 India Pakistan Heat Wave, Yale Program on Climate Change Communication, Down to Earth, Dialogue Earth, Springer Nature UHI Review.
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