Measurements:
°C
°F
Key West
82°F
W 25 mph
Feels like: 90°F
Precip: 0%
World Resorts USA Key West Weather September Weather in Key West

Key West Weather: September

Average Day Temperature: 89.8°F
Average Night Temperature: 86.1°F
Sea Water Temperature: 90.0°F
Number of Sunny Days: 11 days
Sunshine Hours: 11.9 - 12.6 hours
Number of Rainy Days: 7 days
Precipitation Totals: 5.0 in

Air Temperature in September, °F

Select Year: 2024 2023 2022

The highest day temperature in September 2024 was 92°F. The lowest night temperature was 86°F. The average values for day and night temperatures during September were 89.5°F и 88.7°F respectivly.

Key West Water Sea Temperature in September, °F

Select Year: 2024 2023 2022

The average sea surface temperature in September 2024 for Key West was 91.6°F. The maximum and minimum values were 87.6°F and 94.0°F respectively.

Sunny, Cloudy and Gloomy days

Most of the days in September are cloudy but you can also expect sunny or gloomy days.

Precipitation Totals in September, in

Precipitation total in September for Key West is 5.0 in. It makes september the most rainy month of the year.

Wind Speed in September, mph

The average wind speed in September is 9.9 mph. It makes September the most windless month of the year for Key West.

Average Sunny Hours Per Day

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Key West in September is 7.3 hours.

Best Time to Visit Key West
The most sunny months:
March 16 days
April 16 days
May 16 days
The most warm months:
August 91.7 °F
July 91.1 °F
September 89.8 °F
Warmest sea temperature:
August 91.2 °F
July 90.6 °F
September 90.0 °F
The most cold months:
January 74.9 °F
February 76.7 °F
December 78.6 °F
The most rainy months:
August 7 days
July 7 days
September 7 days
The most windy months:
November 14 mph
December 14 mph
March 14 mph

Key West on the Weather Map

USA Resorts:
NAME
Boston +56
Chicago +64
Hawaii +80
Honolulu +80
Houston +74
Las Vegas +44
Los Angeles +62
Maui +74
Miami +84
New York +62
San Diego +52
San Francisco +56
Sarasota +76
Tampa +78
Washington +62
24 Hours Weather Forecast
Key West
Local time: 09:47
05 nov, tuesday
1200 82°F
W
24 mph
1500 82°F
W
22 mph
1800 82°F
W
21 mph
2100 82°F
W
22 mph
06 nov, wednesday
0000 82°F
W
22 mph
0300 82°F
W
24 mph
0600 82°F
W
26 mph
0900 82°F
W
29 mph