It depends on how hot the temperature is.
If it’s below 101, then it’s no different than sitting in a bathtub, and perfectly fine.
I spent an entire weekend in an outdoor hot tub at a big cabin in the Smoky Mountains a few weeks ago. My midwife didn’t have a problem with it, and neither did I. The water stayed at about 98 degrees, and it was chilly outside.
If you are getting overheated.. you know. And you get out of the tub. LOL.