The heat-wave, which the Japan Meteorological Agency (JMA) expects to persist throughout the summer, came as the government called on households and businesses to save electricity to avoid possible power crunch until September.
A weather station recorded a temperature of 40.2C (104.36F) on Saturday afternoon, in Isesaki, a city 85 kilometres (53 miles) northwest of Tokyo, according to JMA.
The figure broke the previous record of Japan's hottest June day - 39.8 degrees observed on June 24, 2011.
"A strong anticyclone from the Pacific, coupled with a cloudless weather, brought the heat," a JMA official said.
Another weather station in central Tokyo logged 35.4C earlier in the day, marking the earliest arrival since records began in 1875 of an above-35C day in the capital, considered extreme heat in Japan.
On Saturday, JMA and the environment ministry issued a heat stroke alert in six of the country's 47 prefectures, recommending people to remain indoors and use air conditioners. ... read more
Source: ANNnewsCH
