Delhi recorded its warmest May night in 14 years on May 21, 2026, as a severe heatwave intensified across north India [1], [2].
This spike in nighttime temperatures prevents the city from cooling down, increasing the risk of heat-related illnesses for millions of residents in the National Capital Region.
The minimum temperature on the night of May 21 reached 31.9 °C [2]. This figure marks the highest minimum temperature recorded for the month of May in 14 years [1].
In response to the extreme conditions, the India Meteorological Department (IMD) has issued orange alerts for the region [1]. These alerts are currently set to remain in effect until May 27, 2026 [1].
The heatwave is part of a broader weather pattern affecting north India. The lack of significant nighttime cooling, a phenomenon often linked to urban heat islands, compounds the stress on public infrastructure and health services.
Authorities continue to monitor the temperature trends as the region enters the peak of the summer season. The IMD orange alert signals that weather conditions may become potentially disruptive to life and property if precautions are not taken [1].
“Delhi recorded its warmest May night in 14 years”
The failure of nighttime temperatures to drop significantly indicates a severe heatwave that limits the body's ability to recover from daytime heat. When minimum temperatures remain high, the cumulative thermal stress on the population increases, which typically leads to higher hospitalization rates and increased energy demand for cooling.
