Current sea water temperature:
+74.3°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 25 | 74.3°F | December 20 | 75.9°F |
| December 24 | 75.2°F | December 19 | 74.5°F |
| December 23 | 75.2°F | December 18 | 74.1°F |
| December 22 | 75.9°F | December 17 | 74.1°F |
| December 21 | 75.6°F | December 16 | 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
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: 03:45
December 25, thursday
0600
72°F
SW
15 mph
15 mph
0900
72°F
SW
15 mph
15 mph
1200
72°F
SW
13 mph
13 mph
1500
72°F
SW
10 mph
10 mph
1800
72°F
S
8 mph
8 mph
2100
72°F
S
9 mph
9 mph
December 26, friday
0000
72°F
S
16 mph
16 mph
0300
72°F
S
15 mph
15 mph
