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Visiting the Florida Keys in December

Travel Tips, Weather, Events and Deals

December ushers in the festive season when the Florida Keys are buzzing with great, festive activities (with a tropical twist). The first half of the month is very quiet on the island and the perfect time to catch a deal. Marathon then starts to get busier the second half of the month as the world goes in search of sand and sunshine for the Christmas and New Year season. The periods between Christmas and New Year are very busy in the Florida Keys so it's important to book in advance.

The Florida Keys offers an array of festive fun during the holiday season. From holiday events, lighted boat parades, and more, the Florida Keys are just the place to enjoy the festive spirit. Tranquility Bay Resort will also get you in a jolly mood with our lighted Christmas tree and exterior festive light decorations.

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Marathon Weather in December

It's getting chilly around the world, but you can expect warm temperatures here in Marathon. In the winter months, cold fronts can bring frost to mainland Florida, but you can be sure there will be no frost here in Marathon. The all-time record low for the area is 41° F (5° C) set in 1981. During these winter months, it rarely rains so guests typically enjoy sunny skies and warm, but pleasant temperatures. It's not uncommon to see periodic temps in the low 80s in December, but the average high is 76° F. Don't miss a majestic Florida Keys sunset at around 5:38 p.m. in December.

Average High Air Temp
76° F (24° C)
Average Low Air Temp
67° F (21° C)
Average Water Temp
72° F (22° C)
Average Rainfall
2 inches (5.1cm)
Average Sunset Time
5:38 p.m. (17:38)

What to Wear in December

Our clothing style throughout the year is "Keys Casual" and most restaurants do not require a dress code. Pack your summer gear, including flip flops, a swim suit, and shorts, but keep in mind that a cold front could sweep through at any time so it's always wise to bring light layers that you can add to your wardrobe when needed. Don't forget a light jacket or blazer and jeans for a night out, along with warmer shoes for the evenings. It is still wise to bring sun screen on your trip and a hat for sunny beach days. Although it can get cold in December, you can also be surprised with temperatures in the low 80s. Nights can be chilly in December but be prepared for glorious sun shining days!

Major December Events and Holidays

In December, escape winter's bite and enjoy our Florida Keys' exciting holiday events.

United States Federal Holidays in December 2021

  • December 25: Christmas Day

Top December Events in Marathon and Nearby

  • December 2, 2021: 25th Anniversary Gala of the Community Foundation of the Florida Keys
  • December 2-5, 2021: Islamorada Sailfish Tournament
  • December 1-12, 2021: Islamorada Junior Sailfish Tournament
  • December 11, 2021: Eight Annual Florida Keys SPCA Parade of the Paws

View all December 2021 events