Oddly, I was doing some temp work for a fake grass laying company last week in that blistering heat on the south west coast.?
Didn't eat all day. Bloods steady on my CGM set up, but was dropping by the afternoon 4pm.
That was still after pre-emting lowering my basal. My girly dancer's frame was commented on as looking wiry by the end of the week. The wife thought I'd been working out. (Probably the sun toning me up too.)
For me, heat increases insulin sensitivity.