It's 74 degrees where I live and when I tried going swimming, the water was way too cold. In fact, one of the maintenance guys saw me and told me to wait a few more days to hop in.
>>74117637rn is good. I've been swimming around midnight (will take pics later if you want me to). The water is cold but is warm once you start moving around.
I like to keep my pool around 85 degrees. That's a nice water temp.