Current sea water temperature:
+73.0°F
| Minimum sea water temperature in January: | 78.8°F |
| Maximum sea water temperature in January: | 66.0°F |
| Average sea water temperature in January: | 73.2°F |
| more information | |
14 days
forecast
forecast
| Key West |
monthly
weather
weather
| Key West |
Sea water temperature for the last 10 days:
| January 1 | 73.0°F | December 27 | 73.6°F |
| December 31 | 74.5°F | December 26 | 73.8°F |
| December 30 | 74.7°F | December 25 | 74.3°F |
| December 29 | 74.1°F | December 24 | 75.2°F |
| December 28 | 74.1°F | December 23 | 75.2°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
January
January
| 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: 18:55
January 01, thursday
2100
64°F
S
7 mph
7 mph
January 02, friday
0000
64°F
S
8 mph
8 mph
0300
64°F
S
7 mph
7 mph
0600
64°F
SW
7 mph
7 mph
0900
64°F
SW
5 mph
5 mph
1200
64°F
W
6 mph
6 mph
1500
66°F
SW
2 mph
2 mph
1800
66°F
S
4 mph
4 mph
