Weather in Key West in December 2025
- December is usually the wettest month of the year in Key West;
Average weather
Average temperature in Key West in December
Going from a maximum of +84°F during the day to a minimum of +57°F during the night, the temperature in December averages around +77°F.
The average maximum temperature goes down 40% by the end of the month, compared with the beginning of the month, from +82°F to +72°F.
Is Key West warm or cold in December?
Key West is typically warm in December.
Maximum temperatures go down compared to the previous month from +79°F to +75°F. The minimum temperature also goes down from +73°F to +70°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how December is compared to other months in Key West:
Climate in Key West in December
| November | December | January | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +79°F | +75°F | +73°F | ||||
| Min. temperature | ||||||
| +54°F | +46°F | +46°F | ||||
| Max. temperature | ||||||
| +88°F | +84°F | +82°F | ||||
| Rainfall | ||||||
| 63 mm | 50 mm | 46 mm | ||||
| Wind | ||||||
| 5 m/s | 5 m/s | 5 m/s | ||||
| Humidity | ||||||
| 76% | 76% | 76% | ||||
| Air pressure | ||||||
| 1015 HPa | 1017 HPa | 1018 HPa | ||||
| Sunny days | ||||||
| 8 | 8 | 10 | ||||
| Cloudy days | ||||||
| 7 | 10 | 10 | ||||
| Rainy days | ||||||
| 15 | 13 | 11 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
December often has better weather than November. It’s getting colder in December. From +79°F in the day, the average maximum temperature lowers to +75°F. As December arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 63 mm to 50 mm. Humidity levels don’t change as the month goes on, averaging around 76%. The average wind speed doesn’t change much during December, staying around 5 m/s. The amount of sunny days stay about the same, averaging 8 sunny days during the month.
January brings much the same weather, it remains good.
Wind
The average wind speed is 5 m/s getting up to 10 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Key West is gradually decreasing during December, going from 3 m/s to 1 m/s over the course of the month.
Rain
How was the weather last December in Key West?
Climate Change Over the Years
The climate in Key West in December has not changed that much over the last 43 years.
The average temperature was the lowest in 1981 (+77°F) and the highest in 2019 (+85°F). The driest year was 2009 with only 624 mm of rainfall, and the wettest year was 2024 with 1925 mm.
FAQ
Is December a good time to visit Key West?
Can you sunbathe in Key West in December?
Is Key West rainy in December?
Is it sunny in Key West in December?
Other cities in USA
Monthly weather in Key West
Source of the data
For this page, we’ve looked at the typical weather in Key West, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
