Bangkok and other parts of Thailand have warned people not to go out in the heat.
The temperature in the capital reached 42C on Saturday. However, the National Weather Service said that the heat index (what the temperature feels like combined with humidity) hit a new record of 54C.
The average temperature in April in Thailand is 37C (98.6F).
Temperatures of over 40C (104F), however, were predicted this weekend in at the very least 28 of its provinces.
Last week, the Thai meteorological service reported a record temperature of 45C (113F).
The recording was made at a Tak monitoring station.
Authorities warn people to avoid outdoor activities and be on the lookout for heat stroke.
In recent weeks, power consumption records were also broken in Asia due to a heatwave.
On 6 April, Thailand used more than 39,000 Megawatts of Electricity – a record that beats the previous 32,000 Megawatts mark from last year.
Extreme heat has also caused power outages and cuts in parts of eastern India, and Bangladesh.
On Tuesday, the Bangladeshi Energy Minister Nasrul Hamid posted on Facebook that there were “untold” sufferings due to heat.
He said that the current heatwave has led to the highest temperatures in 50 years. This has resulted a much higher demand for electricity than anticipated.
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In the capital Dhaka and the western part of Bangladesh, temperatures reached 43C (109.4F).
At least two Indian states, Tripura and West Bengal, have closed their schools this week due to temperatures that are more than five degrees above normal.
Scientists have linked the early summer heat to climate change, claiming that more than one billion people in India or Pakistan are at risk.
The Indian weather service said that heatwaves are more likely between March and may.