I gave myself about 10 minutes to cool off and de-sweatify. I drank a glass of water (I'd also drunk about 16 oz pre-run and about 6 oz during those 3 miles, so I needed a potty break too) and then I decided I couldn't let the day pass without getting all of my intended miles done.
So, I got my visor and sunglasses back on, refilled my water so it was cold, and prepped to head back out into Hades.
2 miles later, I was back at home and glad to be done with that! Even my sunglasses seem to be wilting!
I had purposely not checked the weather before heading out for either run because I knew it would probably deter me, or at least make me second guess my dubious choice, but afterward, I checked and discovered that the temp was 97 degrees. Uff-da!
Normally, I would never run an afternoon 5 miler in this heat, but I'm pleased I got it done and didn't let myself stop at that initial 3 miler. And, afterward, a cool shower and tall glass of iced lemonade never felt nor tasted SO good!