Average sea water temperature in December:
+59.3°F
| Minimum sea water temperature in December: | 67.5°F |
| Maximum sea water temperature in December: | 49.8°F |
Daily sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 58.0°F. The highest and lowest sea temperatures during the month were 64.0°F and 53.1°F.
sea water
temperature
temperature
| St. Simons Island |
monthly
weather
weather
| St. Simons Island |
current
weather
weather
| St. Simons Island |
14 days
forecast
forecast
| St. Simons Island |
Monthly sea water temperature in St. Simons Island, °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 | 79.1°F | 78.4°F |
| Fort Lauderdale | 78.8°F | 77.6°F |
| Honolulu | 78.6°F | 78.3°F |
| Hawaii | 78.5°F | 78.3°F |
| Kauai | 78.3°F | 76.0°F |
| Maui | 78.1°F | 77.8°F |
| Miami Beach | 77.5°F | 75.9°F |
| Oahu | 77.1°F | 77.2°F |
| Islamorada | 76.6°F | 73.4°F |
| Key Largo | 76.5°F | 73.1°F |
| Key West | 76.0°F | 72.6°F |
| Miami | 75.8°F | 73.0°F |
| Everglades | 73.9°F | 69.7°F |
| Marco Island | 71.9°F | 68.0°F |
| South Padre Island | 71.6°F | 71.9°F |
| Naples | 71.5°F | 67.7°F |
| Sanibel Island | 71.0°F | 67.1°F |
| Cocoa Beach | 69.5°F | 66.6°F |
| Siesta Key | 69.3°F | 65.6°F |
Best time for vacation in St. Simons Island
St. Simons Island on a weather map
Places in USA:
Name
°F
24 Hours Forecast
St. Simons Island
Local time: 02:47
December 28, sunday
0300
64°F
E
5 mph
5 mph
0600
64°F
SE
3 mph
3 mph
0900
64°F
SW
1 mph
1 mph
1200
66°F
N
2 mph
2 mph
1500
70°F
N
5 mph
5 mph
1800
68°F
N
5 mph
5 mph
2100
66°F
N
6 mph
6 mph
December 29, monday
0000
64°F
N
7 mph
7 mph
