What happened to fall?

Checking the weather and I see tomorrow night (W5D2) is going to be 90+??  What?!  Ugh.  I do much better when it's not hot and muggy.  It's been so nice running in the cool fall-ish type weather.  :P  At least Friday looks good at 73.  That's the night of my long run without any walking intervals.  Yes I am terrified.  Looking for some good music for that one!