Hi again,
Winter weather in Orlando is completely unpredictable. You could have warm days (80s) with cool mornings, or you could have mornings near freezing with afternoons in the 40s or 50s. Or you could have a little of both, or something in between.
My advice is to pack a little of everything (including swimsuits) and if you get a warm day or days, take advantage of them and go swimming!