And in western Tokyo's Ome, temperatures hit 40.3 degrees Celsius, the first time temperatures over 40 have been recorded in Tokyo's metro area. Picture: AAPA high school student and other stand at a mist spray point for cooling while the maximum temperature exceeds 40 degrees Celsius in Tajimi City, Gifu Prefecture.
As of 11 a.m., 601 of the agency's 927 observation spots had recorded 30 C or higher temperatures.
On Saturday, the Tokyo fire department dispatched more than 3,000 ambulances on Saturday, the most active day in the department's history.
Authorities warned people to stay inside and use air conditioning.
More than 300 people were taken to hospitals for possible heatstroke as of Monday morning, it said.
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Millions were forced to evacuate due to floods and landslides, with most of the 200 people who have died coming from the Hiroshima and Okayama prefectures.
The heatwave has also raised questions over the 2020 Olympics, set to take place in Tokyo over July and August.
The marathon and some other outdoor Olympic events will start early in the morning. Seven of them died last week, the Korea Centres for Disease Control and Prevention said today.
"But our traditional wisdom is not enough to beat the heat like this", she acknowledged, "so we will be using cutting-edge technology".
The mercury hit 39.9 C (103.8 F) in the southeastern town of Hayang, the highest temperature in the country so far this year.
In North Korea, residents fanned themselves on crowded trolleys or protected themselves from the sun with parasols as temperatures in Pyongyang, the capital, reached 34C.