I've been down there the last 2 Februarys, and will be going back this coming February.
This year, we had glorious weather. Upper 70s to low 80s, low humidity, lots of sun. Definitely swimming weather, although we were too busy enjoying the parks to get to the pool that time.

Last year in February, the weather was also warm enough for swimming although it was very cloudy almost the whole time. The weather down there during the winter months can be beautiful or freezing or somewhere in between.
By the way, both times in February the evenings were quite cool. So it is important to bring along clothing you can layer, and be sure to have jackets/sweatshirts along. Especially if you plan to do outdoor shows or parades in the evening where you'll be sitting and waiting for a long time.
What are your dates in Feb.? President's Week is busy, though not nearly as busy as Easter or Christmas weeks. Last year, I was down the week after President's Week, and it was awesome. This coming Feb., I'll be down there the week BEFORE President's Week. Hoping the crowds will be less then too.
Sorry I can't answer your OKW pool question. Have fun planning your trip!
