Florida is the Sunshine State, which means that most water parks stay open all year 'round. Walt Disney World shuts down each of its two water parks for rehab in the winter, but it staggers the closures so that one is always open. Aquatica, which is SeaWorld Orlando's water park, and Wet 'N Wild near Universal Orlando Resort both open daily, as long as the temperature is above a certain level.
Is it a good idea to visit the water parks in the winter? If you're a hearty northerner who can withstand temperatures that would make a Floridian don a jacket, you'll enjoy a day with virtually no lines and all the swimming and sliding you can fit in.
Actually, winter temperature in Florida are often in the 70s, or even 80s, making for comfortable water park weather. The water is often heated, making it comfortable even when the air is a bit chilly. Don't let cooler temperatures fool you. You still need plenty of sun screen so you don't end up like a lobster at the end of the day.
If you visit an Orlando water park in the winter, you might want to make it a half-day stop. On crowded days, you get plenty of rest time because the climb to the water slides is slow due to the lines. With the low winter crowds, you'll probably spend most of your time climbing stairs, so you'll be exhausted within a few hours.
Always pack your swimsuit when you visit Orlando, regardless of the time of year. Winter might be cold, or it might just be mild enough to hit the water in December, January, or February and have an amazingly good time.
Click the video toward the bottom of this article for a video overview of Wet 'N Wild. Check out this article for an Aquatic video tour.