Summerlike temperatures of above 25 C are expected in western, central and eastern Japan from Thursday through Sunday due to warm air blowing in from the south of the country.
As of 10:30 a.m. Thursday, temperatures had reached 22 C in central Tokyo, 21 C in Nagoya, 21.4 C in Osaka and 22.5 in Fukuoka, according to the Meteorological Agency.
In Ginza, Tokyo, many shoppers were seen in short sleeves on the day. In Tokyo, Nagoya and Fukuoka the mercury is expected to hit 25 C or higher.
Temperatures are expected to remain high during the three-day holiday break from Friday, which is unusual for this time of the year.
Foehn phenomenon — hot, dry winds that blow down mountainsides — are expected in the Kanto and Hokuriku regions, with the air becoming even warmer beyond the mountains.