When it is hot out, I ride with the screen down for obvious reasons (I get more air on my body). So that ain't it.
My last bike was a Pacific Coast, which has zero engine heat. So coming from that, this bike is hotter. I don't get burned, but there is hot air coming off the motor that gets the front of the seat hot and swirls around my legs making summer riding hotter than it ever was on my PC. Of course the motor is 1300cc vs 800cc, and the PC had a completely closed body and an internal fiberglass shroud over the motor, so I expect more heat. I think the heat issue is subjective in the sense of what you're used to or ridden prior to the ST. For me the ST is hotter than my PC, but not enough for me to dump the ST and get a PC.
I cannot over state what a BIG difference wrapping the headers has made for me.
YMMV
]Monty[