Current sea water temperature:
+56.3°F
| Minimum sea water temperature in December: | 67.5°F |
| Maximum sea water temperature in December: | 49.8°F |
| Average sea water temperature in December: | 59.6°F |
| more information | |
14 days
forecast
forecast
| St. Simons Island |
monthly
weather
weather
| St. Simons Island |
Sea water temperature for the last 10 days:
| December 16 | 56.3°F | December 11 | 57.7°F |
| December 15 | 57.4°F | December 10 | 59.4°F |
| December 14 | 55.8°F | December 9 | 62.2°F |
| December 13 | 56.1°F | December 8 | 61.9°F |
| December 12 | 56.8°F | December 7 | 61.5°F |
Monthly sea water temperature, °F
When is the warmest sea in St. Simons Island?
Based on the data about daily sea water temperature for the last three years the warmest sea in St. Simons Island was noticed in August, July and September.
Monthly Sea Temperatures in St. Simons Island, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 85.7°F. The highest and lowest sea temperatures during the month were 87.6°F and 83.5°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 84.5°F. The highest and lowest sea temperatures during the month were 87.6°F and 81.7°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 80.7°F. The highest and lowest sea temperatures during the month were 83.5°F and 77.9°F.
current
weather
weather
| St. Simons Island |
weather in
December
December
| St. Simons Island |
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: 16:13
December 16, tuesday
1800
57°F
SW
7 mph
7 mph
2100
55°F
SW
6 mph
6 mph
December 17, wednesday
0000
55°F
SW
4 mph
4 mph
0300
55°F
S
5 mph
5 mph
0600
54°F
S
5 mph
5 mph
0900
55°F
S
5 mph
5 mph
1200
59°F
SW
4 mph
4 mph
1500
61°F
SW
5 mph
5 mph
