Heat is not my friend, at least when I'm trying to run in it.
I ventured out on my first run since the 1/2 marathon and was quickly reminded that heat is not my friend. So I will admit, that it was more like a run/walk. At the same time it felt good.
I'm hoping the sun (can't really remember the last time I saw it) and the endorphins from my run help with my mood.