The city used to get a warning before the heat came. Not anymore.
For as long as most people can remember, Mumbai’s March arrived gently. The worst of winter was gone but summer had not yet shown its teeth. Mornings were soft. The sea breeze came in before ten o’clock. Schoolchildren played outside after lunch without it being a problem. Women hung laundry on terraces and it dried slowly, without the smell of scorched cotton. March, in the lived memory of older Mumbaikars, was almost a gift.
This March, Santacruz Observatory recorded 40 degrees Celsius on March 11. The Ram Mandir area touched 42.5 degrees on March 10. The city crossed 38 degrees on three separate occasions in the first eleven days of the month alone. The India Meteorological Department upgraded its alert to orange for Mumbai and nearby areas including Thane and Palghar, warning of heatwave to severe heatwave conditions, with temperatures running 7.6 degrees above what is normal for this period.
Those are not weather statistics. They are the end of something.
The City the Old-Timers Remember
Radhabai is a composite portrait of several retired women from Dadar and Parel who spent their working lives in Mumbai’s public hospitals. She is seventy-two in this telling, and she says what many of them say.
“In March we slept on the terrace without a fan. There was always a breeze. My grandchildren have no idea what I am talking about.”
Yusuf represents the city’s thousands of dabbawalas, men who have cycled Mumbai’s streets in every kind of weather for four decades. March used to be the best month for the work. Not anymore. By eight in the morning these days, the heat is what May used to feel like.
Pushpa walks to five houses every morning in Bandra East. She carries water now. She wears a cap. She started feeling dizzy during morning rounds this March and she is only fifty-eight. Domestic workers across the western suburbs are quietly rearranging their routines around a heat that used not to arrive until late April.
Rajan, a retired schoolteacher from Borivali, watched Holi from inside his flat this year. He is seventy-eight. “Holi used to feel cool in the morning,” he says, in the manner of someone who has stopped expecting to be believed. “Now standing outside for fifteen minutes feels dangerous.”
Ramesh, sixty-five, a retired railway worker from Dadar, wakes at five in the morning and finds the air already heavy. He remembers March mornings in the 1970s when the city felt fresh and even a thin blanket was sometimes enough at night. He never needed air conditioning in March. Now the fan pushes warm air. Sleep breaks every hour.
These voices belong to an older Mumbai. But the heat is not only a crisis for those who remember what came before it.
The Generation That Has No Before
Imran is twenty-nine. He delivers parcels on a motorbike across Andheri, Goregaon and Malad for approximately nine hours a day, six days a week. He is a composite figure drawn from the common experience of Mumbai’s vast army of gig-economy delivery workers, a workforce that now numbers in the hundreds of thousands across the city and operates almost entirely outdoors, with no canteen, no cooling room and no paid sick leave.
He has never known a cool March in Mumbai because, honestly, he has never paid much attention to which month is which in terms of heat. Heat is just the condition. What he has noticed, and what his colleagues talk about when they stop for water and glucose biscuits near the highways of the western suburbs, is that this year feels different even by recent standards.
“Last year was bad. The year before was bad. But this March I am taking salt tablets that the pharmacist told me about. I never did that before.” He gets headaches by noon if he does not drink enough. His phone overheats and slows down before his body does, which is almost a joke among the riders he knows.
Anil Kadam runs a construction team in Thane. At forty-five, he has been on sites since he was twenty. In earlier decades the crew worked till two in the afternoon and then rested in shade. Now by eleven the heat sits like fog in the head. Last week one labourer collapsed with heat exhaustion. Hospital run. Wages lost for the day.
Meera Joshi has lived in her Bandra flat since 1984. She raised two children there without air conditioning. March meant open windows and light cotton clothes. Now curtains stay drawn all day. The electricity meter spins faster each year. The grandchildren come home flushed and tired.
Imran’s generation did not lose a mild Mumbai March. They inherited a city already mid-transformation. What they are losing is something else entirely: the assumption that the body can manage, that working outdoors through summer is hard but survivable. That assumption is getting more difficult to sustain with each passing year.
Note to readers: The personal accounts in this article are composite portraits representing the shared experiences of ordinary Mumbaikars across generations. They are not transcriptions of any individual interview. All temperature data is sourced from the India Meteorological Department and publicly available research. Expert statements are drawn from remarks made on record to multiple news organisations simultaneously.
What the Numbers Actually Say
Mumbai’s average annual temperature has risen 2.4 degrees Celsius since 1891. That is not a projection or a model output. That is measured, recorded, verified temperature data from the IMD’s own Santacruz Observatory, analysed independently by research organisations and confirmed by international datasets.
In practical terms:
- A March afternoon that averaged 31.5 degrees Celsius in the 1970s now averages closer to 36 degrees in normal years and touches 40 degrees in anomalous ones.
- The anomalous years are becoming less anomalous.
- Nights that used to offer relief now linger at 27 degrees or more.
- Minimum nighttime temperatures in Mumbai are now consistently 2 degrees above normal even during heatwave events.
The all-time March record for Mumbai is 41.7 degrees, set on March 28, 1956. The city came within a degree of that in the first ten days of March 2026, weeks earlier in the calendar than that historic reading. The record itself may not survive this decade.
Climate scientists studying South Asian temperature trends have noted publicly that Indian coastal cities are warming faster than global averages would predict, because they are simultaneously being squeezed by rising sea-surface temperatures and the expanding urban footprint of heat-absorbing concrete. Mumbai is the sharpest example of this double pressure.
Why March Is So Brutal Now
The honest answer is that it is not sudden. But the question is worth answering properly.
Sushma Nair, a senior scientist at IMD’s Mumbai office, has explained in remarks reported by multiple news organisations that the current pattern is driven by easterly winds and anticyclonic circulation near south Gujarat and neighbouring areas. Hot, dry air from the interior of the country is being pushed over Mumbai before the Arabian Sea breeze has a chance to establish itself as a barrier.
Independent weather observer Athreya Shetty put it plainly in public remarks shared widely: “We are seeing daytime highs much above long-term averages. This is because an anti-cyclonic system over Gujarat is bringing in easterly winds from many other areas, including interiors of Maharashtra. Once these cross the Ghats, they tend to sink. That leads to the temperature rise.”
That sea breeze matters enormously. It has historically been the city’s natural air conditioning, arriving by mid-morning and keeping coastal temperatures suppressed even as the rest of Maharashtra baked. Skymet’s senior meteorologist AVM Sharma, who retired from the Indian Air Force’s meteorological division, has noted publicly that delayed sea breeze onset is now a recurring structural feature of Mumbai’s early summer pattern, not a one-off event.
When the sea breeze fails, the city has no backup.
Mumbai has paved over an enormous amount of open ground and tree canopy that previously absorbed heat during the day and released cool air at night. The urban heat island effect amplifies daytime temperatures, sometimes by as much as 2 degrees compared to outlying suburbs. The city’s development model over the last thirty years has prioritised floor-space ratios and construction clearances over what urban planners call green infrastructure. The result is a metropolis that stores heat like a battery and discharges it around the clock.
The Body Does Not Lie
At 32 degrees Celsius with Mumbai’s typical humidity, the human body can regulate its own temperature through sweat evaporation. It is uncomfortable but manageable. At 39 degrees with the same humidity levels, the body’s cooling mechanism begins to fail. The wet-bulb temperature, which is the measure scientists use to assess the combination of heat and humidity as it affects living tissue, climbs into ranges that are physiologically dangerous for extended outdoor exposure.
For a seventy-eight-year-old man on a Borivali terrace, a fifty-eight-year-old woman walking between houses in Bandra or a delivery rider covering thirty kilometres through Andheri on a motorbike, those are not abstract numbers. They are the difference between finishing the day and not finishing it.
The human cost is immediate and specific:
- Hospitals report a rise in heat-related visits. Dehydration sets in fast. Respiratory troubles flare when air quality dips under stagnant heat.
- Outdoor workers lose hours and wages when the sun peaks. For street vendors, an extra 2 degrees means vegetables wilt faster and customers thin out by mid-morning.
- Power use jumps earlier than usual, pushing up electricity bills for families on tight budgets.
India’s public health infrastructure does not yet treat urban heat as a medical emergency at the same level of institutional preparedness as dengue or cholera. Heat deaths are frequently recorded as cardiac arrests or strokes in official data, which means the mortality figures for heatwave conditions in Indian cities are almost certainly undercounted. Funding mechanisms at the national level do not even formally classify heatwaves as disasters eligible for relief assistance in most states, leaving municipal bodies to manage with whatever budgets they can find.
The Longer Pattern
India experienced its hottest March on record in 2022, and the following years maintained abnormal pre-monsoon temperatures across western and central India. Mumbai, because of its coastal position, has traditionally been insulated from the worst of the northwestern heatwave belt. That insulation is weakening.
Between 1973 and 2020, Mumbai recorded ten heatwaves and two extreme heat events. April 2024 reached 39.7 degrees, the highest in fifteen years. By 2040, research projects that up to 60 per cent of Mumbai’s annual calendar could consist of high-heat days. India has experienced a fifteen-fold increase in heatwave days between 1993 and 2024, with a nineteen-fold increase recorded in the last decade alone, according to analysis published by Climate Trends and independently corroborated by the Council on Energy, Environment and Water.
Climate models suggest Mumbai’s March highs could reach 37 to 39 degrees more consistently by 2035. By the 2080s, average temperatures could be between 2.5 and 4.5 degrees higher than the current baseline, depending on the emissions pathway the world follows. The monsoon is not a reliable buffer anymore. Late onset and erratic withdrawal mean the window between pre-monsoon heat and meaningful rainfall keeps stretching.
What Needs to Happen
Mumbai has spent a great deal of institutional energy on flood preparedness since the catastrophic rains of July 2005. The city has invested in pumping stations, drainage upgrades, early warning systems and evacuation protocols. None of it addresses heat.
Vijay Kalantri, Chairman of the World Trade Center Mumbai, speaking at a roundtable on urban heat and public health reported by several news organisations, warned that India’s GDP will fall by 2.5 per cent if rising heat is not curtailed. He added that urban planning needs to be looked at from a fundamentally different perspective and that the city had, in his words, “utilised everything.”
BMC’s Environment and Climate Change department had only four of its forty-one sanctioned positions filled as of mid-2025, according to published reporting. A February 2026 update showed twenty-three posts still vacant. A dedicated office proposed for Worli remains unestablished. This is not a city operating at the level of institutional seriousness the situation requires.
What is missing and what is needed:
- A Mumbai heat action plan that functions at the level of seriousness of its flood response.
- Mandatory cool-roof requirements for new construction. Maharashtra has launched the BeCool Maharashtra programme to scale passive cooling measures, but the focus must now be on speed.
- A ward-level programme to reverse the loss of tree cover.
- Protocols for automatically opening cooling centres when the wet-bulb temperature crosses a defined threshold.
Floods produce visible, photogenic destruction that generates immediate political pressure. Heat kills quietly, and that quietness has for too long been treated as permission to look away.
For citizens, practical steps are available right now:
- Shift outdoor activity to before nine in the morning and after six in the evening.
- Paint rooftops white where possible. It drops indoor temperatures noticeably.
- Carry water regardless of how short the journey seems.
- Check on elderly neighbours and on building and delivery staff who may not have access to cooling.
March Will Not Go Back to What It Was
The people who remember cool March mornings in Mumbai are not being sentimental. They are being accurate. The city they describe was real. The sea breeze that came in before ten o’clock was real. The terraces where families slept without fans in March were real.
That Mumbai still exists in living memory, which is one of the things that makes the current moment so disorienting for older residents. The change has happened within a single lifetime.
Imran, the delivery rider from Andheri, does not have that particular grief. He has a different one. He is twenty-nine and he is already taking salt tablets in March. By the time he is sixty, assuming the current trajectory holds, March in Mumbai could routinely exceed what only the most extreme days produce today.
The data does not allow for much comfort. The trend line runs in one direction. The anomalies are becoming the average. The March of the 1970s is gone, and without serious intervention in both urban planning and national emissions policy, the March of 2026 may one day look, in retrospect, like one of the cooler ones.
That thought should not be received calmly.
Data sources: India Meteorological Department, Santacruz Observatory records; Skymet Weather Services public analysis; IndiaSpend climate research; Berkeley Earth temperature dataset; Climate Trends; Council on Energy, Environment and Water; Maharashtra State Disaster Management Authority. Composite characters represent the shared documented experiences of Mumbaikars across age groups and neighbourhoods. Published by Deshwale, March 12, 2026.
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