water temperature

Hi there! I live in central Texas, and it’s crazy hot. The water temp on my 7k-gallon pool is currently 96 degrees, and I’d like to utilize aeration overnight to cool the water. I bought a PVC waterfall/aeration setup on Amazon: Amazon.com I hooked it up to my return jet per instructions, and...

If my surface temp is 88deg. and my pool thermometer says 86 deg., what is the mean temperature for the body of water? I'd love a way to guestimate this without a 4-foot deep submersible thermometer. Y'all have a great swim today!