Running in the Heat

Ran beginning a bit after 4 pm on the levee.  Sun was out and the temp was in the low 90s.  Humidity was also fairly high.  Ran 9 mi. in 1:46 for a pace of 11:49.  Average HR was 136, Max HR was 142 (not much of a spread).  I let my heart rate get a bit higher because of the heat.  I still think it was a MAF run.  Heat was really affecting me.  I almost cut it short at 1:30, but decided to push through and take my usual Monday.  I actually felt much better that I did following the 2:30 run on Saturday.  Given the heat and humidity and that I finished out this run in pretty good shape considering the temperature, I'd give this run a 3.5.