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High season begins — warm water, calm seas, holiday escape.
Pros
- Warm, reliable coastal weather during peak northern winter freezes
- Exceptional water clarity across the offshore living coral barrier reef
- World-class sight-fishing opportunities in sheltered backcountry waters
- Extensive public boat launches and established paddling water trails
Cons
- Severe holiday traffic bottlenecks along the single-artery Overseas Highway
- Lodging and marina rates spike to high-season maximums in December
- Winter cold fronts can introduce several consecutive days of heavy wind
Best uses
- Winter sea kayak touring
- Shallow water sight fishing
- Reef snorkeling and diving
- Warm-weather coastal camping
Specifications
- Geography
- 1,700-island coral cay archipelago, 125 miles long
- Dec Air Temps
- Highs 75°F to 79°F, lows mid-60s°F
- Dec Water Temp
- 72°F to 76°F across the reef and flats
- Primary Route
- Overseas Highway (US Route 1, 113 miles)
- Key Public Lands
- John Pennekamp, Bahia Honda, Florida Keys NMS
- Permits Needed
- Florida Saltwater Fishing License for anglers
Best for
Winter sea kayak touring, Shallow water sight fishing, Reef snorkeling and diving, Warm-weather coastal camping
Stretching roughly 125 miles southwest from the southern tip of the Florida peninsula, this narrow chain of exposed coral cays divides the shallow, silty waters of Florida Bay from the deep blue of the Atlantic Ocean. By December, the oppressive humidity and hurricane threats of late summer give way to steady northeast trade winds, moderate temperatures, and dry air. For anyone trapped under northern cloud cover, the exposed reefs, shallow backcountry flats, and turquoise cuts offer a dependable winter refuge where saltwater exploration replaces snow shoveling. The trade-off is immediately apparent upon crossing Jewfish Creek onto Key Largo. December signals the opening salvo of high season, marked by steep spikes in lodging rates and dense holiday traffic along US Route 1. Yet if you spend your days on a skiff in the Lower Keys or paddling deep into the red mangroves, the human density evaporates. The ocean drops into the low to mid-70s, calm weather windows allow shallow draft boats to reach the barrier reef, and migrating sportfish stack up in the channels, making this corridor one of the most reliable warm-water winter destinations in North America.
Terrain and Marine Geography
The archipelago breaks down into three functional zones: the Upper Keys, centered around Key Largo and Islamorada; the Middle Keys around Marathon; and the Lower Keys winding out toward Key West. On the Atlantic side, the continental United States' only living barrier reef sits roughly four to six miles offshore, buffered by shallow flats and patches of hardbottom coral. On the Gulf side lies the expansive, ultra-shallow backcountry of Florida Bay, characterized by vast expanses of turtle grass, mudbanks, and labyrinthine mangrove islands. Navigating these waters requires precision; depths outside dredged channels often measure in inches rather than feet, meaning prop-scars are an ever-present hazard and a handheld GPS with updated bathymetry is mandatory gear for any self-guided boater.
December Weather Patterns
December introduces the dry season across South Florida, bringing an average daytime high near 77 degrees and dropping relative humidity to comfortable thresholds. Tropical storm season is officially over, leaving stable high-pressure systems as the prevailing weather engine. However, winter cold fronts sweeping down from the continent can occasionally push through every week or two. These fronts temporarily shift the wind hard out of the north, whipping up rough conditions on Florida Bay, dropping air temperatures into the 50s for a night or two, and churning up sediment on the flats. When the winds clock back around to the east or settle entirely, water visibility clears rapidly, frequently yielding crystalline conditions on the outer reefs.
Wildlife Encounters
Winter movements concentrate life along the transition zones where deep water meets shallow banks. On the offshore reefs and drop-offs, clear winter waters allow clear observation of nurse sharks, southern stingrays, green sea turtles, and dense schools of yellowtail snapper. Inshore, cooling water temperatures draw West Indian manatees into protected residential canals and deeper mangrove creeks seeking thermal stability. The backcountry flats host wintering populations of red drum and seatrout, while bonefish continue to cruise the warming flats on sunny afternoons. Avian life peaks as northern migrants settle in; shallow sandbars regularly hold feeding flocks of roseate spoonbills, magnificent frigatebirds, reddish egrets, and white pelicans escaping the frozen interior of the continent.
Paddling and Route Options
Kayakers and paddleboarders will find the best conditions tucked within the protected mangrove canopies and shallow flats of the Lower Keys. Launching out of Sugarloaf Key or Big Pine Key provides immediate access to backcountry channels where boat traffic cannot follow due to draft limitations. In the Upper Keys, John Pennekamp Coral Reef State Park maintains designated mangrove water trails that shelter paddlers even when Atlantic winds are blowing twenty knots. For long-distance touring, the Florida Keys Overseas Heritage Trail parallels US-1 for cycling, though it requires sharing tight causeways with heavy vehicle traffic. On the water, a well-planned self-supported paddle trip demands careful attention to tidal currents, which rip violently through bridges like Channel 5 and Bahia Honda.
Access and Protection Rules
The entire island chain is wrapped within the Florida Keys National Marine Sanctuary, which imposes strict federal conservation regulations to protect sensitive habitats. Anchoring directly on living coral is illegal; boaters must use maintained white mooring buoys when visiting popular reef tracks like Sombrero Key or Molasses Reef. Several zones are designated as Sanctuary Preservation Areas (SPAs), where all extractive activities, including any form of fishing or shell collecting, are prohibited. Anglers operating from shore, skiff, or kayak must possess a valid Florida Saltwater Fishing License with appropriate endorsements. State parks like Bahia Honda and Long Key require day-use vehicle fees, and beach parking lots regularly hit capacity by mid-morning on sunny December weekends.
The Seasonal Trade-offs
Visiting during the start of the holiday rush demands operational patience. The Overseas Highway is largely a single-lane road in each direction outside the commercial strips of Marathon and Key Largo. A minor vehicle accident or construction zone can easily turn a two-hour drive into a five-hour crawl, with zero alternate bypass routes available. High season drives nightly lodging and boat charter rates to their annual maximums, and prime backcountry guides book out six months in advance. To beat the crush, run your logistics on an early schedule: clear bridge channels and boat ramps at dawn, secure dock space before early afternoon, and avoid driving between keys during peak midday transit windows.
How we picked
We built this ranking from trip reports, agency data, permit records, and our editors' own time on the ground. 10 places made the final cut out of a much longer working list, and each one had to clear the same set of criteria before it earned a spot.
- Quality of the terrain
- Landscape, route variety, and whether the place rewards multiple days rather than one overlook.
- Season and weather windows
- How long the reliable window is, and how badly the shoulder seasons punish a bad forecast.
- Access and permits
- Trailhead logistics, permit odds, quotas, and how much lead time a trip realistically takes.
- Solitude vs. crowding
- How far you have to walk before the place feels like wilderness instead of a queue.
- Wildlife and ecology
- What you can reasonably expect to see, and what you have to plan around.
- Risk and skill required
- Navigation, water crossings, exposure, and rescue distance — stated plainly.
Florida Keys — frequently asked questions
- Is Florida Keys worth the trip?
- We rank it #8 in US Destinations in December. High season begins — warm water, calm seas, holiday escape.
- Who is Florida Keys best for?
- Best for winter sea kayak touring, shallow water sight fishing, reef snorkeling and diving and warm-weather coastal camping. Standouts: warm, reliable coastal weather during peak northern winter freezes and exceptional water clarity across the offshore living coral barrier reef.
- What are the drawbacks of Florida Keys?
- Severe holiday traffic bottlenecks along the single-artery Overseas Highway, Lodging and marina rates spike to high-season maximums in December and Winter cold fronts can introduce several consecutive days of heavy wind.
- What are the key details for Florida Keys?
- Geography: 1,700-island coral cay archipelago, 125 miles long · Dec Air Temps: Highs 75°F to 79°F, lows mid-60s°F · Dec Water Temp: 72°F to 76°F across the reef and flats · Primary Route: Overseas Highway (US Route 1, 113 miles) · Key Public Lands: John Pennekamp, Bahia Honda, Florida Keys NMS
- Terrain and Marine Geography — what should I know about the Florida Keys?
- The archipelago breaks down into three functional zones: the Upper Keys, centered around Key Largo and Islamorada; the Middle Keys around Marathon; and the Lower Keys winding out toward Key West. On the Atlantic side, the continental United States' only living barrier reef sits roughly four to six miles offshore,…
- December Weather Patterns — what should I know about the Florida Keys?
- December introduces the dry season across South Florida, bringing an average daytime high near 77 degrees and dropping relative humidity to comfortable thresholds. Tropical storm season is officially over, leaving stable high-pressure systems as the prevailing weather engine.
Where on earth
Satellite imagery flying in from a world view to Florida Keys, Florida, United States. Use the + / − buttons, or click the map to zoom with your scroll wheel; drag to pan and pinch to zoom on touch.
Florida Keys, Florida, USA · 25.098, -80.437
Wildlife found around Florida Keys
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