18.12
thu
thu
Day
61°F
N 9 mph
Precip.
0%
0%
Night
61°F
NE 10 mph
Precip.
100%
100%
19.12
fri
fri
Day
70°F
SE 11 mph
Precip.
0%
0%
Night
59°F
SE 7 mph
Precip.
0%
0%
20.12
sat
sat
Day
61°F
SW 4 mph
Precip.
0%
0%
Night
55°F
SE 1 mph
Precip.
0%
0%
21.12
sun
sun
Day
61°F
SE 5 mph
Precip.
0%
0%
Night
55°F
SW 6 mph
Precip.
0%
0%
22.12
mon
mon
Day
61°F
SW 15 mph
Precip.
0%
0%
Night
55°F
S 11 mph
Precip.
0%
0%
23.12
tue
tue
Day
61°F
SW 11 mph
Precip.
0%
0%
Night
57°F
SW 6 mph
Precip.
0%
0%
24.12
wed
wed
Day
64°F
E 3 mph
Precip.
0%
0%
Night
59°F
NE 5 mph
Precip.
0%
0%
25.12
thu
thu
Day
66°F
E 9 mph
Precip.
0%
0%
Night
61°F
E 6 mph
Precip.
0%
0%
26.12
fri
fri
Day
63°F
NE 4 mph
Precip.
0%
0%
Night
57°F
NW 3 mph
Precip.
25%
25%
27.12
sat
sat
Day
66°F
NE 6 mph
Precip.
0%
0%
Night
61°F
E 6 mph
Precip.
0%
0%
28.12
sun
sun
Day
68°F
E 7 mph
Precip.
0%
0%
Night
63°F
SE 4 mph
Precip.
0%
0%
29.12
mon
mon
Day
61°F
SW 16 mph
Precip.
73%
73%
Night
61°F
W 10 mph
Precip.
100%
100%
30.12
tue
tue
Day
66°F
NE 4 mph
Precip.
0%
0%
Night
64°F
W 3 mph
Precip.
0%
0%
sea water
temperature
temperature
| St. Simons Island |
monthly
weather
weather
| St. Simons Island |
current
weather
weather
| St. Simons Island |
7 days
forecast
forecast
| St. Simons Island |
Sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 59.6°F. The highest and lowest sea temperatures during the month were 64.0°F and 53.6°F.
Sea water temperature in January, °F
Show year:
2025
2024
2023
The average sea water temperature in January of 2025 was 52.9°F. The highest and lowest sea temperatures during the month were 58.1°F and 48.9°F.
Air temperature in St. Simons Island, °F
Precipitation total in St. Simons Island, in.
* Charts above show average data for the last 3 years.
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: 00:44
December 18, thursday
0300
59°F
NW
4 mph
4 mph
0600
57°F
NW
3 mph
3 mph
0900
57°F
NW
5 mph
5 mph
1200
61°F
N
9 mph
9 mph
1500
64°F
N
8 mph
8 mph
1800
63°F
N
10 mph
10 mph
2100
63°F
N
14 mph
14 mph
December 19, friday
0000
61°F
NE
10 mph
10 mph
