If Spring Is This Hot, What Will Summer Be? Delhi’s Record March Heat Signals a Climate Emergency

Delhi has just experienced its hottest day in early March in the last 50 years. The Safdarjung weather station recorded 35.7°C in the first week of March, around 7°C above the seasonal average, according to the India Meteorological Department (IMD).

This might seem like just another hot day in a city used to extreme weather. But the timing matters. March is supposed to be spring in north India. If temperatures are already touching 36–38°C in early March, experts say the coming months could push cities like Delhi into dangerous territory.

The IMD has already warned that India may see an above-average number of heatwave days between March and May this year, suggesting a longer and harsher summer season.

In simple terms: if this is how spring ends, what will peak summer look like?
A pattern that is getting worse every year

Extreme heat is no longer an occasional weather event in India — it is becoming the new seasonal norm.

The country has witnessed three consecutive years of intense heatwaves, including the devastating 2024 heatwave, when temperatures crossed 50°C in parts of north India and more than 40,000 suspected heatstroke cases were reported across the country.

Scientific evidence shows the trend is accelerating. A multi-city study published in Science of the Total Environment found that heatwaves in India are associated with significant increases in mortality across major cities including Delhi, Mumbai, Chennai and Kolkata.

Another analysis estimates that around 1,116 deaths each year in ten major Indian cities can be attributed to heatwaves, highlighting the growing public-health burden of extreme heat.

Historically, heatwaves have already taken a heavy toll. Studies suggest over 24,000 people have died in India due to heatwaves since 1992, though experts believe the actual numbers are likely higher because many deaths go unrecorded as heat-related.

A study referenced in The Lancet also found that heat-related deaths in India increased by 55% between 2000-2004 and 2017-2021, reflecting how climate change is intensifying extreme weather risks.
Heat is also hitting the economy. The same report estimated that 167.2 billion labour hours were lost due to heat exposure, equivalent to about 5.4% of India’s GDP.

For outdoor workers, construction labourers, street vendors, sanitation workers, this is not just uncomfortable weather. It is a life-threatening working condition.

Cities are heating faster than the countryside
Urban areas are especially vulnerable. Rapid construction, shrinking green cover, and the urban heat island effect, where concrete and asphalt trap heat are causing cities to warm faster than surrounding rural areas.
Research shows that urbanisation is intensifying heat and extreme weather across India’s cities, making them more vulnerable to heatwaves, flooding, and climate shocks.

A study by the Council on Energy, Environment and Water (CEEW) found that nearly 60% of Indian districts are already at high or very high risk from extreme heat, affecting around 76% of the country’s population.

India has begun responding to the heat crisis with Heat Action Plans (HAPs). These plans are designed to reduce heat-related deaths through early warnings, public awareness campaigns, medical preparedness, and cooling measures.

Delhi released its Heat Action Plan in 2024, coordinated by the Delhi Disaster Management Authority. The plan includes measures such as heat alerts, cooling centres, water distribution points, public awareness campaigns, and training for healthcare workers to handle heat-related illnesses. However, we could spot very little of these measures on ground.

The major focus remains on emergency response such as issuing advisories rather than addressing structural causes of urban heat, like the loss of tree cover, lack of shaded public spaces, and heat-absorbing building materials.
But we need to move beyond warnings and make adaptation plans with climate change in mind. Without aggressive adaptation measures, heatwaves in India will become longer, more frequent and more intense in the coming decades.

Experts say cities must begin investing in heat-resilient infrastructure — more trees, reflective roofs, shaded markets, climate-friendly building materials, water bodies, and accessible cooling shelters.

For millions of people who live and work outdoors, such measures are not luxuries. They are essential for survival.

Delhi’s record March heat should therefore be seen not just as a weather event, but as an early warning.

If spring itself is already breaking temperature records, the real question is no longer whether extreme heat will arrive this summer.

The question is whether our cities are ready for it.

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Nibedita Saha

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