I find this topic funny. I grew up in South TX swimming all my life. I never even thought about what temp I liked my pool water at, but it was TX, so I'd assume it was pretty hot, > 90F. Now I live in Southern IL and after being without a pool for 10 years, I now have one again. The water temp had gotten up to 88 to 90, which I thought was nice. But the cloudy/rain weather the last week knocked it back down to 78. I've got it back up to 82 now with the solar cover and some sunshine between rain storms. Today we should get a full day of sunshine and 90 degrees, so I'm hoping to get my water up closer to 85 or so soon.
Long story short, 82 degrees or colder is too much for me to enjoy, unless maybe it was 100 outside. 85 and below is pushing. I guess I'm just a south texas guy.