I went swimming on Saturday. I had minor surgery on the 7th, so this was the first day I was allowed. I hadn't been in the pool since the 4th, and we had a few evenings that got down to 40 degrees, although the daytime temps have still been in the 80's, and even still a few 90's. Anyway, I had the solar cover on the pool, but the water still was about 75 in the top layer, and felt more like 70 or so at the bottom. Quite a bit cooler than the first weekend of October! My husband laughed at me.