30 - 40 Deg Heat

[S Mitchell]

I'll wear my kilt in those temps, but not for extended outside activity. Of course, in the Phoenix area, it gets so hot there's nothing comfortable to wear for extended outside activity! (except maybe a wet sheet...) When I wore my wool kilt at Disney, the weather was just shy of the temperature range you're asking about and it wasn't too bad.

When it's very hot, though, I tend to wear my PV casual kilt with a tee shirt and boots (Doc Martens) with scrunched cotton socks rather than tall wool socks. I haven't tried sandals. I think they might go pretty well with a utility kilt.