My experience is the heat seems to be linked to wind. I live in a coastal area which is very windy. (Average wind speed - 14 mph with gusts around 35-50mph.) In my neck of the woods, the heat is always pouring on my right (or left leg, depending upon which direction I'm headed). When I get into areas where there is less wind, like the hill country, I don't feel the heat anymore.
I always wear full gear, which includes either mesh overpants or textile overpants, and full-length riding boots. To me, the heat seems to come from the radiator via the fan, not the exhaust. In the summer it will regularly break 100F. I don't think the heat is an issue. You can feel it, but it's not overwhelming.
-Never mistake kindness for weakness.
-Harley Davidson rEvolution engine (V-Rod): Designed by Porsche, detuned by Harley.