The mercury exceeded 35 C on Tuesday in the Kanto and Tokai regions, where temperatures rose from the morning.
According to the Meteorological Agency, temperatures hit 39 C in Kuwana, Mie Prefecture; 38.8 C in Koshigaya and 38.5 C in Yorii, Saitama Prefecture. It was 38.3 C in Kiryu, Gunma Prefecture and Sano, Tochigi Prefecture.
Central Tokyo registered 37.5 C, exceeding 35 C for the third consecutive day.
The agency and the Environment Ministry issued a heatstroke alert for 22 prefectures.
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