It is 105 degrees F (41 degrees C
) here, right now, at 8% humidity. That is, of course, not in the direct sun.

If you can stay in the shade, have air blowing on you, and not become dehydrated, it's not too bad.

I guess it was last summer, I did an experiment, though not very scientific, and took note of the difference, heat wise, of my wool kilt before and after I removed the "pillow butt" and replaced it with hair canvas etc. Huge difference. I think a lot of the heat issue is in the number of layers around your waist, that includes the belt and possibly the sporran.