Lake water temperature is always recorded in the shade, in about 2 feet of water at the Golf Course Road bridge. In that location on sunny days in June, July and much of August, the lake varies in temperature by about 5 degrees F every day. It is at its lowest at about 9 am and at its highest at about 5 pm. On cloudy days there is less change and on rainy days there may be no change or the temperature may even drop a little.  As September approaches, there is less daily temperature variation and the overall trend is downward.

In more open water, there will be more temperature variation due to more exposure to the sun, so much so that many people think that they are swimming through colder springs near the bottom of the lake. This is not the case, however. Swimmers are simply encountering cooler water below the sun-warmed surface.