Current sea water temperature:
+74.7°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 11 | 74.7°F | January 6 | 73.6°F |
| January 10 | 74.5°F | January 5 | 72.7°F |
| January 9 | 74.5°F | January 4 | 72.3°F |
| January 8 | 73.8°F | January 3 | 71.6°F |
| January 7 | 73.4°F | January 2 | 72.3°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: 09:30
January 11, sunday
1200
77°F
SW
10 mph
10 mph
1500
77°F
SW
11 mph
11 mph
1800
73°F
S
12 mph
12 mph
2100
70°F
S
15 mph
15 mph
January 12, monday
0000
70°F
S
17 mph
17 mph
0300
70°F
S
16 mph
16 mph
0600
70°F
SW
21 mph
21 mph
0900
70°F
SW
25 mph
25 mph
