Horrid run

I was supposed to run 11 miles today. I didn't start until past 7 am. It was already above 80 degrees and VERY humid. Much of the paths were I run are in the sun. After 7 miles, about two of them in the bright hot sun, I was in serious discomfort. There were a few bursts of speed along the way, but the last 5 miles were mostly walking. So I did reach the goal, just not running. I have to get up earlier and avoid the hotter parts, even if it means looping the same area five times. I feel depleted and defeated. I'll try for a long run mid-week again. Right now I'm trying to revive myself with fluids.