Current sea water temperature:
+76.8°F
| Minimum sea water temperature in December: | 80.6°F |
| Maximum sea water temperature in December: | 70.0°F |
| Average sea water temperature in December: | 75.7°F |
| more information | |
14 days
forecast
forecast
| Key West |
monthly
weather
weather
| Key West |
Sea water temperature for the last 10 days:
| December 4 | 76.8°F | November 29 | 76.3°F |
| December 3 | 77.0°F | November 28 | 78.1°F |
| December 2 | 76.5°F | November 27 | 77.9°F |
| December 1 | 75.9°F | November 26 | 77.4°F |
| November 30 | 74.8°F | November 25 | 77.5°F |
Monthly sea water temperature, °F
When is the warmest sea in Key West?
Based on the data about daily sea water temperature for the last three years the warmest sea in Key West was noticed in August, July and September.
Monthly Sea Temperatures in Key West, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 88.8°F. The highest and lowest sea temperatures during the month were 90.7°F and 86.9°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 86.7°F. The highest and lowest sea temperatures during the month were 88.0°F and 85.1°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 86.9°F. The highest and lowest sea temperatures during the month were 89.2°F and 85.3°F.
current
weather
weather
| Key West |
weather in
December
December
| Key West |
Best time for vacation in Key West
Key West on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Key West
Local time: 22:30
December 05, friday
0000
75°F
W
14 mph
14 mph
0300
75°F
W
13 mph
13 mph
0600
77°F
W
11 mph
11 mph
0900
75°F
W
7 mph
7 mph
1200
75°F
W
11 mph
11 mph
1500
77°F
W
12 mph
12 mph
1800
79°F
NW
11 mph
11 mph
2100
77°F
NW
10 mph
10 mph
