Yesterday and today; our water is down to 82 with just a solar cover (no heater, solar or otherwise). More and more shade as the sun angles lower, and next week is supposed to be cooler, so I suspect we'll do a last dip next weekend to say we swam in October, then pull the solar cover off and wait for the leaves to arrive en masse for scooping. But if we can hold to the 80s, maybe one more week after that. Looking into adding some solar panels, which I think would give us a few more weeks and start things off sooner in March/April.