Training time

Its come that time of year again when I spend most of my time outside working on something, this year with my rescue I want to spend a lot of time working with her and my own mare. I live where it gets super hot during the day, to where it would be unsafe to even have horse work in it. So, upon experience, which is better to work in. Cooler early morning after the sun has been up an hour or two, or later warmer afternoon when the sun is close to setting? I unfortunatly don't have the option of working inside an arena, its all outside.

When I lived in California we would work our guys early... we'd throw a flake of hay for them to munch on, give them an hour and then ride, then put them away with their grain/supplements waiting for them if they weren't hot. If they were hot, a quick rinse, hang out in the wash rack for awhile, then back to the pens they'd go... I liked it because if my young guy was particularly naughty, I could come back out in the evening and reinforce a lesson. It worked pretty well for us as we had a great show year with that routine...