Knowing when to chill

I waited too late to get out this morning. I've run in this temperature before, but today it just seemed to take a lot more out of me. Wanted to push for 6 mi, but at 1.5 mi, my Spidey Sense was telling me to sit this one out. Going to spend the rest of the day walking around in my compression socks. Can't take the chance of getting hurt before my next milestone race. I'm going to grant myself a time-out so I can come back swinging.