Serpentine belts squeal after wheeling in hot climate?

Hey guys,

First time experiencing or noticing this. I went on a long trail run in 85-90 degree weather and when I got out of my truck to air up my tires I heard what sounded like belt squeal. After getting home and running my truck in a cooler climate the next day I don't hear it anymore. I guess belts getting hot and loosening up a little can cause this? Should I add a little tension to my belts to compensate for when I run my truck hard in a hotter climate? I didn't notice any engine temp, power steering or AC issues and my belts aren't cracking, maybe they are at the early stages of dry rot. 60k miles on this set of belts at the moment, but I think they are also like 10 years old, previous owner didn't drive much. I'll have to look at the service history when I get home.