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For many people, the heat no longer ends when the sun goes down. Across several Indian cities, nights are staying warmer than they should, offering little relief after already hot days. New data shows that 26 cities recorded above normal night-time temperatures on April 5, pointing to a worrying trend that often gets less attention than daytime heat. But warm nights can be just as draining. When the body does not get enough time to cool down, the strain of summer begins to build quietly, one restless night at a time.
Warm nights are spreading across more Indian cities
According to the Indian Meteorological Department, 26 cities recorded above normal minimum temperatures, while 10 cities also saw above normal daytime highs on the same day. Among them, Guwahati reported the sharpest departure in maximum temperature, with the day running 3.9°C above normal. That kind of deviation this early in the season is a reminder that heat stress is building unevenly across the country, with some places already moving into uncomfortable territory before peak summer has fully set in.
What makes warm nights particularly concerning is that they often go unnoticed compared to daytime heat. But from a health perspective, they matter deeply. When temperatures remain high at night, homes, roads and buildings hold on to the day’s heat for longer, especially in dense urban areas. High temperatures during the night prevent the human body from cooling down effectively. Moreover, this lack of recovery time increases the risk of severe heat stroke. Additionally, persistent heat worsens non-communicable diseases like diabetes and hypertension. The effects of repeated heat exposure can begin to build over several days rather than just during a single hot afternoon.
Why warmer nights can be more dangerous than they seem
Unlike daytime heat, which people can often respond to by seeking shade, drinking water or limiting outdoor activity, midnight heat offers fewer chances to recover. For many households, especially those without cooling or proper ventilation, the heat simply lingers indoors. That makes warm nights particularly difficult for older people, children, outdoor workers and those with pre-existing illnesses, all of whom are more vulnerable when the body does not get enough relief between hot days.
This is also why India’s weather agencies have begun paying closer attention to minimum temperatures, not just daytime peaks. In its latest seasonal outlook for April to June 2026, IMD said minimum temperatures are likely to remain above normal across most of the country, even in places where daytime highs may not always stay exceptionally high. That means the discomfort many cities are seeing right now is not an isolated blip, but part of a broader seasonal pattern that could continue through the coming weeks.
India’s heat story is no longer just about afternoons
The bigger climate signal here is that India’s summers are changing in more than one way. Heat is not only arriving earlier or staying longer during the day, but it is also becoming harder to shake off after dark. That shift matters because rising night-time temperatures can intensify the overall burden of heat, particularly in cities where concrete, traffic and built-up neighbourhoods trap warmth long after sunset. In practical terms, that means people are spending more hours of the day and night under thermal stress, even if official heatwave thresholds are not crossed everywhere.
The IMD has already warned that above normal heatwave days are likely in April over parts of Odisha, West Bengal, Tamil Nadu, Puducherry and Andhra Pradesh, along with isolated pockets of Gujarat, Maharashtra and Karnataka. But the rise in warm nights suggests that the season’s real impact may be broader than daytime heat alerts alone can capture. For many Indians, the first sign of a harsher summer may not be a blistering afternoon. It may simply be the fact that the night no longer feels like relief.
References:
https://www.omnicuris.com/medshots/daily_updates/night-time-heatwaves-india-health-risks
Banner image: Photo by ARMAN JOSAN on Unsplash
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