Yes, the water in Florida in December is plenty warm to swim in. If you plan on spending a lot of time in the ocean you will want to head to the more Southern parts of Florida as they will have warmer water temperatures.
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During the cooler months, the farther south you go, the warmer it will be. Fort Lauderdale, Miami, the Keys, Marco Island and Naples will have the warmest water during the winter. During the summer months, the Gulf of Mexico will be five or more degrees warmer than the Atlantic Ocean.
Can you swim in December? Even though it may be too cold to swim in December where you live, at Disney World the pools are heated which means even if the air is a bit chilly, the pools are still a comfortable temperature. In addition to the pools at the resorts, at least 1 of Disney's 2 water parks will remain open.
For those looking for a sandy beach getaway in the middle of winter, Marco Island is a perfect choice. Located on the west coast of Florida right on the Gulf of Mexico, Marco Island features four miles of ocean-front beaches. Marco Island is also a great option for nature lovers.
January. January is the coolest month of the year in Florida, with average lows of around 49 F (around 10 C) in Orlando. However, temperatures in the middle of the day can hit 74 F in the Florida Keys (around 23 C), making it possible to spend plenty of time exploring the great outdoors.