I like this - colors, composition - it matches the title nicely (although, objectively, I'm not sure heat is required for a shot like this, it still _feels_ hot to look at it). I like the buildings, the way they break the line of the horizon. The painterly feel of the sky is lovely. This is not only a good temperature photo, but an excellent photo in general.
This is a nice photo. The only request I have, is that you shift the camera a little more to the left, the smaller building and tree's are kind of irritating to me, but other than that, it is a marvelous picture. Good job
now really, how hot can it get in Iceland? I was there once when it hit 80 in the day and people were swiming in glacial rivers but that was highly unusual. Nevertheless, those clouds do look like they are on fire! I like how you've used the hill Perlan is on to obscure the busy cityscape (except for Halgrimskirkja) and help the composition focus on the clouds.
This doesn't necessarily indicate soaring temperatures but it does look like a warm climate and is certainly a beautiful shot, with great colour and atmosphere. [6]