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I agree that with the high air temps right now, 101 doesn't sound inviting at all. We keep ours normally at 99 or 100, but I'm seriously considering trying to bring it down, maybe 85 to 90, and just try it. But not being a chem expert, I didn't know if that cooler temp would have any affect on the chems/sanitization?
Anything below body temp is good, but it depends on how long you plan on spending in the cool water. When we go to our naturist swims in the winter at a local athletic club, they turn up the water and air temps a bit for our crowd because we are not there to swim laps or work ourselves into a sweat. That pool can get a mite cool at times, and it takes a little physical exercising to keep the body temp up. Thus - we tend to migrate between the pool and the two hot tubs. The tubs are typically running at 102 to 104. We have run of the entire place for two hours - men's and women's areas.Regarding our own tub - we've kept it at about 95-97° during down time, then turn it up to 102ish for evening soaks. When the sun goes away for the day here in the great northwest, we lose the temperature too. It may be 85° or 90° here during the day, nighttime temps are almost always in the 50's. Rarely does it stay above 60 overnight.We lived in Austin for 2 years during the 80's... we well remember those hot muggy days and hot muggy nights. Rain meant higher humidity but rarely a reduction in temperature, no matter what time of the day or night.I'd say try 90, then 85... Getting wet and getting out cools you too. Just like running through a sprinkler. And the less clothes, the better.