Last year, we were in the 93-94 temps in mid August. This year with more clouds and relatively frequent afternoon showers, the highest we've hit is 91. Like drsipe, above, my wife would prefer 93 as minimum temp.
Here's a question--probably most applicable to people in the gulf south, but other places maybe, too. Have you considered rerouting the condensate drains from your central air to the pool? Depending on locale and A/C size, your air conditioning can take 5-20 gallons of moisture from the air every day. Even a whole house dehumidifier can generate 10-12 gallons of "sort-of" distilled water a day. As you know, that condensate is cold water, and it's also wasted water, since it typically goes into the sanitary sewer line. It's pretty clean and pure and so would not add anything to the pool but cool water, helping with two summertime pool issues: evaporation and heat.
I'm right now getting quotes for a whole house dehumidifier, and part of my plan is to route the condensate via PVC or PEX piping to the pool. I'm also considering having the A/C condensate rerouted at the same time. Am I crazy?