Key West Weather in December
December is one of the perfect months to visit Key West, with daytime temperatures of 25°C (77°F) and lows of 21°C (70°F) at night. Some rainfall is typical for this time of year.
Rainfall in Key West in December
The climate data from previous years indicates about 10 days of rain, averaging 54 mm (2.1 in) for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Key West in December
Weather in Key West is at its perfect in December. Highs reach 25°C (77°F), while nights settle around 21°C (70°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. At 21°C (70°F) overnight, nights are warm enough to sit outside comfortably in light clothing.
Sunshine in Key West in December
The city usually sees around 236 hours of sunlight, indicating many sunny days — a great month for sightseeing.
Average water temperature in December
The water temperature is 24°C (75°F), which most people find very comfortable. A good month for swimming and water sports.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March, April, November and December typically offer the best weather for Key West.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Key West's climate page.
Key West Temperature in December
Min Temperature
21°C (70°F)
Max Temperature
25°C (77°F)
Water Temperature
24°C (75°F)
Chance of Rain
33%
Precipitation
54 mm (2.1 in)
Rainy days
10 days
Humidity
76%
Sunshine
236 hours
Percentage Sunshine
71%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Key West typically stay consistent throughout December, with daily highs averaging around 25°C (77°F). Nights are pleasant, with lows typically ranging from 19°C (66°F) to 21°C (70°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Key West in December
Browse day-by-day weather records for Key West spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Key West historical weather extremes in December
According to our 49 years of weather records for Key West, the following extremes were recorded between 1976 and 2025.
- On December 4, 2018, temperatures climbed to 30°C (86°F), marking the warmest December day on record.
- On December 26, 1983, Key West saw its coldest December day with temperatures maxing out at 11°C (52°F).
- The coldest night in December in Key West was on December 24, 1989, with a minimum of 7°C (45°F).
Best Places in the United States of America in December
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in December →
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What to Wear in Key West in December
Warm temperatures in December make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Rain gear is recommended, you can expect wet weather on multiple days. The water temperature sits at about 24°C (75°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Key West in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Key West's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full Key West climate overview or explore weather in the United States of America.
