Dangerously high temperatures are forecast for many regions across Japan on Tuesday.

The Japan Meteorological Agency says a high pressure system will cover wide areas from eastern to western Japan and drive temperatures up.

By 11 a.m., the mercury had risen to 36.5 degrees Celsius in Nagoya City and 35.9 degrees in Nishiwaki City, Hyogo Prefecture, and Yamaguchi City.

Daytime highs of 38 degrees are forecast in Osaka, Nagoya, Kofu and Kumamoto cities.

The agency and the Environment Ministry have issued heatstroke alerts for 35 of the country's 47 prefectures.