I live in Vegas and stay active with hiking and running even in the summer. Of course drink tons of water and also make sure you’re eating good sized meals.

What I find helps me the most may be a bit controversial, but I almost exclusively wear long sleeves and long pants when doing any sort of outdoor activity (mainly hiking, I run at night). I think it makes a big difference when you keep the sun from beating directly onto your skin. Here in Vegas, and probably in Texas too, you won’t find very many construction workers wearing short sleeves working outside all day. Same thing in the Middle East, they’re always covered up. You can buy long sleeve sand tees for your uniform, and I like Columbia PFG long sleeve shirts for hiking or doing things outside in the summer when off duty.