The tourist agencies for any group tour should be giving lessons before departure, during the flight, and after landing before being turned loose on the population. Even before the pandemic, Chinese tourists made American ones look like angels, but with the current raging torrent of incoming tourists, and COMPLETE and FLAGRANT disregard for local manners, they're managing to really test the limits of Japanese patience.
It doesn't take much: look around, and if no-one else is doing it, don't do it.
Don't sit on the floor in a shop.
Don't block the entire sidewalk.
Don't drag your check-in baggage around town with you.
Jesus fucking christ, they suck.
…as for the weather, we've got one more month, and then it'll cool off. We're looking at mid-september before it starts to wane. The humidity is nuts. I went upstairs from my airconditioned living room, and as I ascended the stairs, it felt like walking upward into an inverted bowl of soup.