Mumbai Heat Statistics: 

February 2025: 26th touched 38.7c (+ 5.9c)...Hottest in 5 years. 

All Time record for February is 39.6c in 1966.

March 2025: 11th March touched 39.2c.

All Time March Record is 41.7c in 1956.

In Mumbai, days when the maximum temperature exceeds 37 degrees Celsius, or settles between 4.5 degrees Celsius to 6.4 degrees Celsius above normal, it is classified as a heatwave.

A severe, or extreme heatwave, occurs when the daytime maximum temperature settles at 6.5 degrees above normal or more. 

Based on an analysis of India Meteorological Department (IMD) data, the recently unveiled Mumbai Climate Action Plan (MCAP) shows that the city has experienced a total of 13 heatwaves since 1977. 

More than half of these (8) occurred in the last 15 years, in line with the rising annual temperatures in Mumbai. IMD data indicates that between 1973 and 2020, the city has grown warmer by 0.25 degrees Celsius each decade.

 Mumbai saw heatwave events in 1977, 1981, 1985, 1989, 1995, 2005, 2009, 2013, 2014 and 2018. Severe heatwaves occurred in 2004, 2011,  March 2022, 2023, 2024, 2025.

Mumbai’s average annual temperature has remained consistently above normal for the last 16 years, and data shows that the city is getting hotter. Between 1973 and 1998, the annual mean temperature of the city showed an average departure from normal of +0.004 degrees Celsius per year, which rose to +0.011 degrees Celsius per year between 1999 and 2008, and then further to +0.042 degrees Celsius/year between 2009 and 2020.

Actually for Mumbai, More stress is on Urban Heat islands Effect :

“The overall air temperature trend highlights warming related to global climate change, whereas the trend of increase in late evening and night-time temperature points to a much more localized phenomenon associated with city-scale urbanization and development. The long-term trends of increasing night-time and evening temperatures correspond well with the concept of urban expansion, whereas the rise in post-monsoon and winter temperature trends point to the post-monsoon heat phenomenon,” the MCAP states, though the raw data has not been provided.

India Heat Waves

2101-2023..Heat Wave Days 👇

Min wise record breaking morning temp (27/02/2025)

Dehradun 16.7°C (New ATR)

Sriganganagar 18.0°C New ATR

Old ATR 16.9°C (2021)

Amritsar 17.4°C 

Matched with ATR 17.4°C (2021)

Safdarjung, Delhi 19.5°C

Old ATR 17.2°C (2015)

Ambala 18.2°C (New ATR)

Rohtak 18.0°C (New ATR)

Bikaner 21.4°C (2nd ATR)

Churu 19.8°C (2nd ATR)

Palam, Delhi 19.1°C (2nd ATR)

Chandigarh 18.5°C (2nd ATR)

Hisar 18.3°C (2nd ATR)

Meerut 16.8°C (2nd ATR)

Vagaries