Of course temps can vary greatly, but typically you should be fine that time of year. We have swam on every trip we've ever done, from January and December to March and November. Now we're from northern Ohio so we're pretty tough when it comes to the cold (my kids will swim when it's in the 60s!) but the pools are always heated so you should be fine unless exceptionally cold-sensitive (my niece in TX won't swim unless it's 90-100 out)
Good luck!