Summer in Japan is hot and humid!

Around 400,000 cases of heat illness are reported annually, with more than 40,000 people being rushed to hospital.

If you feel sick / ill when it's hot, ask for HELP.

Drink plenty of water. Keep out of the sun and hot places. Keep cool.

Check this site.
http://www.wbgt.env.go.jp/en/
https://www.city.taito.lg.jp/index/kurashi/kenko/kenkokikikanri/necchushonichui.html