More than 1,400 people have died, as forecasters warned that searing temperatures would continue.
In the worst-hit state of Andhra Pradesh nearly 900 people have died since May 18 — double the total number of heat-related deaths last summer.
In New Delhi, forecasters said they expected the high temperatures to continue into next week — adding to the misery of the thousands of poor living on the capital’s streets with little shelter from the hot sun.
Residents of Gurgaon — a high-rise satellite city that is home to many of the capital’s workers — suffered power cuts of up to 10 hours a day as the electricity grid struggled to cope with the demand from millions of air conditioners.
“Nothing is working — even after taking half a dozen baths a day, you can’t beat the heat,” 34-year-old shop owner Manish Singh said in Gurgaon.
Eating onions and drinking buttermilk (both of which are thought to be hydrating), lying in the shade, and crowding into rivers, Indians are doing whatever they can to stay cool amid the heatwave.