Japan experienced its first “extremely hot day” on Wednesday as the temperature hit 35 degrees Celsius in Fukushima Prefecture and rose above 30 C in parts of Tokyo, the Meteorological Agency said.

The city of Date, Fukushima Prefecture, saw the mercury rise to 35.2 C around 1:55 p.m., while the temperature jumped to 30.2 C in Tokyo’s Nerima Ward around 12:50 p.m.

In the city of Fukushima, near Date, the wet bulb globe temperature (WBGT) — a measure of heat combined with humidity, and by extension heat stress conditions on humans — was 27.5 C at 11 a.m., just shy of the Environment Ministry's "severe warning" level, at which point it is said heavy exercise should be avoided.