Every summer, temperatures across India climb higher and stay high for longer — and the heat is no longer just uncomfortable, it is deadly. Heatwaves now rank among the country's most serious and fastest-growing climate hazards, and they fall hardest on those least able to escape them: the people who work, live or sleep outdoors. The tragedy is that heat illness is largely preventable. This guide explains why heatwaves are worsening, who is most at risk, and how to stay safe.
Why heatwaves are intensifying
The underlying driver is climate change, which is raising average temperatures and making extreme heat more frequent and severe. Cities amplify the problem through the urban heat island effect: concrete, asphalt, vehicles and a lack of greenery absorb and trap heat, so built-up areas stay dangerously hot — including at night, when the body needs to recover. The result is longer, hotter heatwaves and record temperatures that are becoming the new normal across much of India, especially April to June.
Who is most at risk
Heat does not strike everyone equally. Most vulnerable are:
- Outdoor workers — construction labourers, farmers, street vendors, delivery riders, who cannot avoid the sun.
- The homeless — with no cool place to shelter, exposed day and night.
- The elderly and young children — whose bodies regulate temperature less well.
- Pregnant women and people with chronic illnesses.
Poverty compounds every risk: without a fan, cooling, safe drinking water, or the ability to stop work and rest, people are far more likely to fall ill. Protecting the vulnerable is the heart of heat safety.
Recognising heat illness
Knowing the signs can save a life:
- Heat exhaustion — heavy sweating, weakness, dizziness, nausea, headache. Move to a cool place, give fluids, cool the body, and rest.
- Heatstroke — a medical emergency: very high body temperature, hot skin (dry or flushed), confusion, or collapse. Seek medical help immediately, move to shade, and cool the person aggressively with water while waiting. Heatstroke can kill quickly.
Hospital care for severe cases may be covered under Ayushman Bharat for eligible families.
How to stay safe
- Stay hydrated — drink water regularly, even without thirst; use ORS if sweating heavily.
- Avoid the peak heat — stay indoors or in shade during the hottest hours (roughly noon to 4 pm).
- Dress for it — light, loose, light-coloured clothing; hat and umbrella outdoors.
- Cool down — fans, wet cloths, cool baths; keep homes ventilated.
- Adjust activity — schedule hard outdoor work for early morning or evening; take frequent breaks in shade.
- Never leave anyone — child, elderly person or pet — in a parked vehicle.
Heat Action Plans: protecting communities
Beyond individual precautions, cities are increasingly adopting Heat Action Plans — coordinated strategies that include early-warning systems, public awareness, adjusted work and school hours, cooling shelters, water provision, and hospital preparedness. Where implemented well, they have significantly reduced heat deaths, proving that this is a hazard we can manage. Heat is also increasingly recognised as a disaster to prepare for, not just endure.
What you can do
- Protect the vulnerable around you — check on elderly neighbours, outdoor workers and the homeless.
- Offer water and shade — set out water for workers, delivery riders and animals.
- Share safety information before and during heatwaves.
- Support NGOs providing heat relief, water and shelter, and advocate for shade, trees and cool public spaces.
Heatwaves are a growing danger, but they are a manageable one — with awareness, simple precautions and care for the vulnerable, most heat deaths can be prevented. This summer, stay cool, stay hydrated, and look out for those most exposed to the heat. To support relief and climate-resilience organisations, find verified NGOs on NGOLists.
Further reading on NGOLists
- Disaster Risk Reduction: Is India Ready for the Next Climate Disaster?
- Winter Shelter Crisis: Protecting India's Homeless from the Cold
- Earth Day: Grassroots Climate Action Stories from India
- Delhi-NCR Air Pollution: Causes, Health Impact and What Citizens Can Do
- Ayushman Bharat PM-JAY: Eligibility, Coverage and How to Apply in 2026