Also point out the high doesn't last that long usually. Not like Phoenix where it'll be 90 degrees at 1am and you have trouble sleeping. When I lived in San Jose in August and September I'd just open the windows at night and close them in the morning. Usually the house would stay bearable though the afternoon and early evening.

I remember May and June weather as 'nice'. August and early September as 'hot'. And then October through early December as 'nice'.