Winter in Marathon

Winter in Marathon stretches from December through February and is one of the most popular times to visit the Florida Keys. The season offers cooler, pleasant temperatures, warm ocean waters, and a wide array of activities, making it ideal for travelers seeking outdoor adventure, relaxation, and festive experiences.

During the winter months, Marathon enjoys mild and comfortable weather. Daytime temperatures generally range from the low to mid-70s, while evenings cool to the mid-60s, offering a refreshing break from the hotter summer months. Humidity levels are lower than other seasons, averaging around 65–70%, which makes outdoor activities such as hiking, biking, and exploring the islands more enjoyable. Rainfall is limited, typically averaging 2–3 inches per month, meaning most days are sunny and ideal for water sports and sightseeing. Ocean temperatures remain inviting, averaging 74–77°F, perfect for swimming, snorkeling, diving, and boating throughout the season.

Winter is a fantastic time to explore the natural beauty of Marathon. Snorkeling and diving are excellent, thanks to clear waters and calm seas. Wildlife enthusiasts can take eco-tours to spot dolphins, manatees, and migratory birds, while kayakers and paddleboarders can enjoy peaceful exploration of mangrove tunnels and backcountry flats. Fishing is also at its peak, with dry season conditions providing ideal opportunities to catch species such as mahi-mahi, sailfish, and wahoo.

The season also brings festive and community-focused events. December features holiday boat parades that light up the harbors with decorated vessels, while New Year’s celebrations include fireworks, waterfront parties, and special dining experiences. Local fishing tournaments and eco-workshops provide additional opportunities for both fun and education, allowing visitors to experience Marathon like a local. Winter events are family-friendly and offer a lively, engaging atmosphere without the peak-season crowds.

Evenings in Marathon during winter are especially enjoyable. Cooler temperatures make sunset cruises, dockside dining, and waterfront strolls more comfortable. Visitors can relax with fresh seafood and cocktails while watching the sun dip below the horizon, or enjoy live music and local entertainment at island restaurants.

Winter is an excellent season for couples seeking a romantic getaway, families looking for outdoor adventure, or solo travelers hoping to unwind in a serene, picturesque environment.

Whether you’re interested in water sports, wildlife experiences, holiday festivities, or simply soaking up the tranquil island ambiance, winter in Marathon delivers a perfect combination of warm waters, mild weather, and seasonal charm.

It’s a time when the Florida Keys are at their most inviting, offering a balance of relaxation and adventure that appeals to every type of traveler.

Average Winter Temps & Climate

Dec:  High 78°F / Low 65°F

Jan:  High 76°F / Low 63°F

Feb:  High 77°F / Low 65°F

Humidity Index

Winter is drier than other seasons, averaging 65–70%, which makes outdoor activities much more comfortable compared to the humid summer months. The lower humidity also enhances the feeling of crisp, fresh air, especially in the mornings and evenings.

Rainfall

Winter is the driest season in Marathon, with total monthly rainfall averaging 2–3 inches, making it ideal for boating, fishing, and outdoor excursions. Rainfall is typically limited to occasional brief showers, and most days remain sunny and pleasant. The dry conditions also help maintain clear waters, providing excellent visibility for snorkeling, diving, and wildlife viewing.

Water Temperatures

Dec:  ~75–77°F

Jan:  ~74-76°F

Feb:  ~74-77°F