I've been looking at surface temperature records for Indian cities going back to the 1950s, and the trend is not subtle anymore. It's visible. Allahabad in May used to hit 44°C on maybe five or six days. Now it regularly crosses 44°C for two to three weeks. Delhi's average maximum in April has risen by nearly 1.5°C since 1970. These might sound like small numbers, but for a body that's already operating near its heat-tolerance limits, they're significant.
Climate change in India isn't a future problem. It's a current one, and it's showing up in ways that are specific to this geography.
The Monsoon Is Changing — Just Not How You'd Expect
The frustrating thing about climate change and the Indian monsoon is that total seasonal rainfall hasn't dropped dramatically in most regions. What's changed is the distribution. Instead of steady, well-distributed rain over four months, we're seeing longer dry spells followed by intense, concentrated downpours. The same annual total might now fall in 30 days instead of 70.
For farmers, this is a disaster. Crops that evolved with steady, predictable monsoon rain can't adapt quickly to weeks of drought followed by flooding. For cities, storm drainage systems designed for a different rainfall pattern are overwhelmed by these concentrated events. Bengaluru, Chennai, and Mumbai have all experienced severe urban flooding in years where total seasonal rainfall was actually near average — just delivered differently.
The Himalayas Are Melting, and That Matters to Everyone
About 700 million people in South Asia depend on rivers fed by Himalayan glaciers for water supply, especially during dry months when the monsoon isn't running. These glaciers are retreating at rates not seen in at least 400 years, according to multiple studies. In the short term, this can actually increase river flows as melting accelerates. The long-term picture — when significant glacial mass is lost — is serious water insecurity for some of the most densely populated river basins on earth.
The Indus, Ganges, and Brahmaputra systems are all glacier-dependent. The Indus especially: Pakistan and northwest India's agriculture runs on that river system. Water stress in that region doesn't stay contained to weather charts.
Coastal India's Sea-Level Problem
India has roughly 7,500 km of coastline and some of the world's most densely populated coastal zones. Global average sea level has risen by about 20 cm since 1900, and the rate is accelerating. In the Bay of Bengal, the combination of sea-level rise and land subsidence in the Ganges-Brahmaputra delta means some Sundarbans islands have already disappeared. The ones that remain are losing freshwater access to saltwater intrusion — making traditional agriculture impossible.
For coastal cities like Mumbai, Chennai, and Kochi, storm surges that used to be rare 1-in-100-year events are becoming more frequent as the baseline sea level rises. Protecting these cities will require infrastructure investments that go far beyond standard flood management.
None of this is inevitable doom — countries that invest seriously in climate adaptation can meaningfully reduce the impacts. But it does require treating weather data not just as today's forecast, but as evidence in an ongoing shift that's already underway.
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Dr. Arun Sharma
Author & ResearcherPh.D. in Atmospheric Sciences, M.Sc. Meteorology
Dr. Arun Sharma has over 15 years of experience researching tropical meteorology, monsoon dynamics, and atmospheric modeling in South Asia. He oversees WeatherPulse's weather data verification standards and climate trend models.
