It's getting cooler already. But it always takes a few days for all the stored heat to dissipate. Up here in the far north, the sun doesn't set at all for most of the summer. This period of late July is actually the first time in several weeks when it goes below the horizon!
"Upon my word I've had as much excitement on a car as in the air, especially since the R.F.C. have had women drivers."
James McCudden, Five Years in the Royal Flying Corps