Being new to whole solar heating thing, we accidentally got our water up to 94 degrees with panels and solar cover. Now that will be great for hot-tubbing on a moonlit night, and we will probably do that sometimes, but for trying to cool off on a 90 degree mid-day, it was like being simmered alive. Got it down to 85, but it took two days. One day with the fountain running all day and the solar cover off part of the day, and this last day with the fountain running all day and the solar cover off all night. (We lost 1/2 inch of water in those two days by the way.)
We are still trying to decide what is our "favorite" temp. 89 is great for evening swimming when our usual 10-20mph winds are blowing (windchill is very real with pools in the Great Plains). Mid afternoon in full hot sun with only 5-10 mph wind, 85 seems better. But our normal norm is going to be 90-100 degrees with 20-30 mph winds blowing in the heat of the day. Not sure what the ideal temp for that is yet.
We are still trying to decide what is our "favorite" temp. 89 is great for evening swimming when our usual 10-20mph winds are blowing (windchill is very real with pools in the Great Plains). Mid afternoon in full hot sun with only 5-10 mph wind, 85 seems better. But our normal norm is going to be 90-100 degrees with 20-30 mph winds blowing in the heat of the day. Not sure what the ideal temp for that is yet.
....back down to 79 today and we have rain and lower temps (in the 80's) coming in for the next few days 
