I know exactly what you mean - although we've got such a strange summer this year. Either it's really hot or colder but incredibly humid. And the last week we had rain and thunderstorms every second day. I was relieved it was colder but didn't change the fact that you were soaked as soon as you moved more than 1 metre because it was humid as hell.

I don't know... why can't it be 25°C with a slight breeze. That's my perfect summer!