Idk about Texas but heat is relative and you acclimate to where you live. In winter for example you go to Fla and I bet Texas is the same they wear winter coats and imo it’s still summer and wear shirts and a tank top.
I just plain and simple shoot during any heat. No drama, no thought about it. I’m an electrician though and if I’ve got to dig or backfill a trench middle of the day during a heat wave I just do it. If I’ve got to get in an attic to work on an air handler or recessed lights so be it, if I’ve got to climb to work on pole lights in a heat wave well that’s my job that day. Shooting when I get home with sweat still running down my nose after I worked out in that same heat is a relaxing, fun thing. Now super cold is much more challenging with numb fingers and lots of layers on plus beat up joints/muscles disagreeing with the cold.