You're also from a warmer region and probably more climatized to that kind of weather. Us Seattle guys start to wither and melt in the 90-95F+ weather.
Even riding an ST with it's wind protection, I've been the victim of heat exhaustion. You don't even have to be on a moving vehicle to feel the effects.
My 1st 1000+ mile ride was from Seattle to Sacramento, then back to Ashland for WeSTOC. I was in sad shape when I arrived there. On the way to CreSTOC we hit 105F down around Bishop. Solid jacket and cooling vest was perfect for me! YMMV