Measurements:
°C
°F
CURRENT WEATHER
07:30
Key West
76°F
W 19 mph
Feels like: 80°F
Precip: 0%
World Resorts USA Key West Weather

7 Day Weather Forecast

12.18
thu
DAY
80°F
NW 19 mph
precip
0%
NIGHT
80°F
N 9 mph
precip
0%
12.19
fri
DAY
76°F
SE 11 mph
precip
0%
NIGHT
74°F
S 14 mph
precip
0%
12.20
sat
DAY
74°F
SW 11 mph
precip
0%
NIGHT
76°F
SW 7 mph
precip
0%
12.21
sun
DAY
76°F
SW 14 mph
precip
0%
NIGHT
76°F
SW 19 mph
precip
0%
12.22
mon
DAY
76°F
SW 19 mph
precip
0%
NIGHT
76°F
SW 24 mph
precip
0%
12.23
tue
DAY
76°F
W 23 mph
precip
0%
NIGHT
76°F
W 25 mph
precip
100%
12.24
wed
DAY
76°F
W 22 mph
precip
0%
NIGHT
76°F
W 20 mph
precip
0%

Key West Sea Water Temperature in December, °F

Select Year: 2025 2024 2023

The average sea surface temperature in December 2025 for Key West was 24.8°F. The maximum and minimum values were 23.4°F and 26.3°F respectively.

Key West on the Weather Map

Best Time to Visit Key West
The most sunny months:
May 16 days
March 16 days
April 16 days
The most warm months:
August 91.6 °F
July 91.0 °F
September 89.7 °F
Warmest sea temperature:
August 91.3 °F
July 90.6 °F
September 90.1 °F
The most cold months:
January 74.5 °F
February 76.6 °F
December 78.2 °F
The most rainy months:
June 7 days
August 7 days
September 6 days
The most windy months:
November 14 mph
December 14 mph
January 14 mph
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