Also depends where the poster is from - if they live in a hot climate, they may be a) comfortable with the temperatures and/or b) actually getting away from even hotter weather elsewhere! Hot, per se, doesn't overly bother me if I am meandering around a city, and as a Brit, our holidays as children to southern Europe were always in July and August, so perhaps I just got used to it! I will add that while northern Europe (e.g. UK) is generally a better bet for cooler temperatures, northern cities are also far less likely to be geared up for hot weather, so a city used to high 20s low 30s heat, with all the AC that comes with it, may end up being more comfortable than a city like, for example, London, in the mid-high 20s.