Key West (FL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Key West.
Climate overview of Key West
Key West, Florida, United States of America, has a moderate seasonal temperature range, with August reaching 32°C (90°F) and January cooling to 24°C (75°F).
With around 1007 mm (40 in) of annual rainfall, Key West has a notably wet climate. The wettest month is September. The sunniest month is May, with 11.4 hours of sunshine per day on average.
Key West Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Key West - and find the best time to visit.
Monthly Temperature in Key West
The weather in Key West changes moderately throughout the year, offering enough variation to appreciate each season. Average daytime temperatures reach a very warm 32°C (90°F) in August. In January, the coolest month of the year, temperatures drop to a comfortable 24°C (75°F).
At night, temperatures range from around 27°C (81°F) in August to 19°C (66°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Key West
Key West is known for its substantial rainfall, with annual precipitation reaching 1007 mm (40 in). Key West can be quite wet during September, receiving approximately 163 mm (6.4 in) of precipitation over 23 rainy days.
In contrast, during the driest month (March), you will experience much drier conditions, with 27 mm (1.1 in) of precipitation spread across 7 rainy days. For more details, please visit our Key West Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Key West
Key West experiences moderate variation in sunshine hours across the seasons. With 11.4 hours daily sunshine in May, it dips to 7.7 hours in November, offering a balanced mix of sunny and overcast days.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Water Temperature in Key West
The mean water temperature over the year ranges from 22°C (72°F) in January to 31°C (88°F) in August.
Water temperature over the year
Humidity in Key West by Month
The relative humidity is high throughout the year in Key West.
The city experiences its highest humidity in February, reaching 76%. In April, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Key West
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: January, February, March, April, November and December
- Warmest weather: June, July, August and September
- Most sunshine: April, May and July
- Fewest rainy days: February, March and April
- Best for swimming: Any time of year. The sea stays pleasantly warm year-round.
- Wettest months: June, July, August, September and October, when rainfall is highest.
Frequently asked questions about the climate in Key West
What is the best time to visit Key West?
January, February, March, April, November and December typically offer the most optimal weather in Key West. In contrast, July, August, September and October tend to have less optimal conditions.
What temperatures can I expect in Key West?
Daytime highs range from 24°C (75°F) in January to 32°C (90°F) in August. Nighttime lows range from 19°C (66°F) to 27°C (81°F).
How much rain does Key West get?
Annual rainfall is around 1007 mm (40 in). September is the wettest month with 163 mm (6.4 in), while March is the driest with 27 mm (1.1 in).
How sunny is Key West?
Key West receives around 3,413 hours of sunshine per year. May is the sunniest month with 341 hours, while November is the cloudiest with just 231 hours. Overall, Key West enjoys abundant sunshine.
Key West 3-Day Forecast
Key West on the map
Key West is highlighted - select any city to see its climate.
Popular this month
Where to go in August - average daytime high across popular destinations.
Kissimmee
33°C (91°F) Orlando33°C (91°F) Miami Beach32°C (90°F) Destin32°C (90°F) New York City
29°C (84°F) Big Bear Lake
27°C (81°F) Los Angeles
24°C (75°F) San Francisco22°C (72°F) 
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