Temperatures in Vietnam were also forecast to be high during the five-day national holiday, with temperatures forecast to reach 41 degrees Celsius in the north.
Forecasters there said extreme heat would last through the end of April, with cooler conditions expected in May.
India's weather department said on Saturday that extreme heat conditions will continue in many states till the weekend with temperatures rising up to 44 degrees Celsius at some places.
“I have never experienced this heat before,” Ananth Nadigar, a 37-year-old advertising professional, told AFP from Bengaluru.
“It's very unpleasant and it takes away your energy.”
The world's largest democracy is in the midst of a six-week long general election, with millions of voters lining up in scorching temperatures on Friday.
The Election Commission of India said it has formed a task force to review the impact of heat wave and humidity before each round of voting.
And in Bangladesh, millions of students returned to schools that had been closed due to extreme temperatures, although its weather bureau said on Sunday that the heat would continue for at least the next three days.
