The forecast looked the same in most of neighboring Pakistan, where government forecasters this week said a high-pressure area would likely keep temperatures above normal through Monday.
The Pakistan Meteorological Department also warned that in regions strewn with glaciers, the heat could lead to so-called flash floods, where water flows from glacial lakes into populated areas. In 2013, a burst of flooding in the northern Indian state of Uttarakhand led to flooding that destroyed villages and killed thousands of people.
In both countries, forecasts only listed temperature, not the heat index — a measure that combines temperature and humidity and gives a more accurate picture of what extreme weather feels like.
Fusaram Bishnoi, a doctor in Barmer, an area of Rajasthan, which has recorded some of the highest temperatures in India this week, said it had seen a surge in patients with heat-related illnesses in recent days. That includes not only heat stroke, he said, but also foodborne illnesses linked to the consumption of food spoiled in the heat.
“We tell people not to go out during the day and to drink more and more water,” said Dr. Bishnoi.
“Everything is ready to burn.”
The extreme heat is a problem for agriculture, a primary source of income for hundreds of millions of people on the subcontinent. In India, wheat farmers have been saying for weeks that high temperatures are damaging their crops. Indira Gandhi Memorial’s tulip garden closed a week early this spring, as many bulbs had flowered and then died before a month-long annual exhibition ended.
Mr Bose, the farmer, who lives in the Barmer district of Rajasthan, said about 15 to 20 percent of the local wheat crop, as well as half of the cumin crop, had already been lost due to unusually warm weather and changes in wind flow. . It doesn’t help, he added, that the current heat wave has made it more difficult to work outdoors.