I didn't say average, and the highs are higher for many days. It sounds like you've never been in extreme heat, there's a huge difference between 89F and 110+F. More people are moving here than are leaving.
And would you mind not being a condescending prick? If you had taken a second to google you would know Tokyo had highs of 40+ this summer.
Sounds like you're just trying to make excuses for your awful city.