Nothing really seems that hot any more after 120 - 140 degrees with 50 lbs of body armor and ammo in Iraq. It is all perspective.
The trick is drink lots of water, a quart an hour is a good starting point, and perspective. As you sit there at a stop light in traffic roasting alive, having to **** because of all the water you drank, enjoying the smell of exhaust, just realize that it is very unlikely you will die from heat.
Sorry, three wars and PTSD are kicking my ass lately.