Current sea water temperature:
+74.7°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 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 |
| December 27 | 73.6°F | December 22 | 75.9°F |
| December 26 | 73.8°F | December 21 | 75.6°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: 20:41
December 30, tuesday
2100
64°F
S
22 mph
22 mph
December 31, wednesday
0000
64°F
S
19 mph
19 mph
0300
64°F
S
18 mph
18 mph
0600
64°F
S
22 mph
22 mph
0900
61°F
S
18 mph
18 mph
1200
61°F
S
18 mph
18 mph
1500
63°F
S
16 mph
16 mph
1800
64°F
S
14 mph
14 mph
