Really? I'm not finding it cold at all (and I'm normally a 'cold' person - I usually wear 3 layers at work in an office).
My heating has been turned off since mid-May and for the last few weeks I've been sleeping in shorts and a t-shirt, with the window open all night, and my thinnest quilt, which I keep kicking off because I'm too hot!
It's still 20-22 degrees this week, which is about average for July/August, and about 25 degrees and sunny by the weekend.