Oof, 41°C / 106°F with 80+ humidity is brutal. I can just imagine little to no winds and that air just sitting. I plan on visiting Japan someday but am definitely avoiding going during the peak summer months.
I always tell people to go in late autumn or March-ish (but avoid cherry blossom season unless you like insane crowds). Maybe a bit warmer times if you’re doing mountain climbing or something
It’s unfortunately killing their beautiful gardens, especially the moss. So go and see them as soon as you can.
It’s supposed to be 33 again Friday (and probably still like 90% humidity as it was today). I moved out of Tokyo to get away from that nonsense. I’m slightly worried I didn’t move far enough north
I’m so grateful that I had a chance to live in Japan before its climate became completely unbearable. Summers there were already rough.