World Resorts USA St. Simons Island Weather

St. Simons Island 7 Days Forecast

14.09
mon
Day
93°F
SE 4 mph
Precip.
10%
Night
79°F
NW 2 mph
Precip.
11%
15.09
tue
Day
90°F
W 10 mph
Precip.
11%
Night
77°F
SW 6 mph
Precip.
8%
16.09
wed
Day
86°F
SW 11 mph
Precip.
1%
Night
73°F
SW 5 mph
Precip.
18%
17.09
thu
Day
82°F
SW 11 mph
Precip.
17%
Night
75°F
SW 4 mph
Precip.
34%
18.09
fri
Day
90°F
W 7 mph
Precip.
3%
Night
73°F
SW 3 mph
Precip.
36%
19.09
sat
Day
82°F
SW 11 mph
Precip.
58%
Night
73°F
SW 4 mph
Precip.
16%
20.09
sun
Day
88°F
SW 6 mph
Precip.
9%
Night
73°F
N 4 mph
Precip.
11%

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.

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

Sunniest months:
January 15 days
October 15 days
April 15 days
Warmest months:
July 89.1 °F
August 87.4 °F
June 86.3 °F
Warmest sea temp:
August 85.1 °F
July 84.8 °F
September 82.0 °F
Coldest months:
January 59.4 °F
December 62.5 °F
February 64.1 °F
Rainiest months:
August 5 days
July 4 days
September 4 days
Windiest months:
February 6.9 mph
January 6.9 mph
April 6.9 mph

St. Simons Island on a weather map

Current weather
17:08
St. Simons Island
+90°F
NW 6 mph
Feels like: +95°F
Precip.: 2%
Places in USA:
Name
°F
Boston
+68°F
Washington
+75°F
Hawaii
+79°F
Las Vegas
+91°F
Los Angeles
+84°F
Miami
+86°F
Maui
+72°F
Myrtle Beach
+91°F
New York
+75°F
Panama City Beach
+95°F
San Diego
+72°F
San Francisco
+64°F
Santa Monica
+77°F
Sarasota
+88°F
Chicago
+72°F
all places
24 Hours Forecast
St. Simons Island
Local time: 17:08
September 14, monday
1800
90°F
NW
6 mph
2100
79°F
NW
4 mph
September 15, tuesday
0000
79°F
NW
2 mph
0300
77°F
SW
2 mph
0600
75°F
SW
4 mph
0900
84°F
W
7 mph
1200
90°F
W
10 mph
1500
90°F
W
12 mph
Units of measurement: °C / °F