Average sea water temperature in December:
+75.7°F
| Minimum sea water temperature in December: | 80.6°F |
| Maximum sea water temperature in December: | 70.0°F |
Daily sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 75.9°F. The highest and lowest sea temperatures during the month were 79.3°F and 73.6°F.
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Monthly sea water temperature in Key West, °F
Which USA resorts have warmest sea in December?
| Place name | December 2025 | December 2024 |
|---|---|---|
| Kailua Kona | 79.3°F | 78.3°F |
| West Palm Beach | 79.0°F | 78.4°F |
| Fort Lauderdale | 78.7°F | 77.6°F |
| Honolulu | 78.6°F | 78.3°F |
| Hawaii | 78.5°F | 78.3°F |
| Kauai | 78.2°F | 76.0°F |
| Maui | 78.1°F | 77.8°F |
| Miami Beach | 77.4°F | 75.9°F |
| Oahu | 77.1°F | 77.2°F |
| Islamorada | 76.5°F | 73.4°F |
| Key Largo | 76.4°F | 73.1°F |
| Key West | 75.9°F | 72.6°F |
| Miami | 75.6°F | 73.0°F |
| Everglades | 73.7°F | 69.7°F |
| Marco Island | 71.9°F | 68.0°F |
| South Padre Island | 71.7°F | 71.9°F |
| Naples | 71.5°F | 67.7°F |
| Sanibel Island | 71.0°F | 67.1°F |
| Cocoa Beach | 69.6°F | 66.6°F |
| Siesta Key | 69.3°F | 65.6°F |
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: 15:03
December 30, tuesday
1800
66°F
S
21 mph
21 mph
2100
68°F
S
19 mph
19 mph
December 31, wednesday
0000
68°F
S
18 mph
18 mph
0300
66°F
S
18 mph
18 mph
0600
64°F
S
19 mph
19 mph
0900
64°F
S
20 mph
20 mph
1200
66°F
S
16 mph
16 mph
1500
66°F
S
14 mph
14 mph
