People across Japan have been urged to take precautions against a heatwave that has killed about 30 people.
Thousands more have sought hospital treatment for heat-related conditions over the past two weeks.
Temperatures reached 41C in central Japan earlier this week.
In the city of Kyoto temperatures has risen above 37.5C for seven days in a row for the first time since records began in the 19th Century.
The Japanese education ministry told schools to take thorough measures to prevent heat stroke after a six-year-old boy died following an outdoor class in Aichi Prefecture on Tuesday.
Japan’s meteorological agency urged people to drink sufficient water to prevent heat exhaustion.
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