Measurements:
°C
°F
CURRENT WEATHER
09:40
St. Simons Island
88°F
SW 7 mph
Feels like: 94°F
Precip: 5%
World Resorts USA St. Simons Island Weather

7 Day Weather Forecast

09.15
tue
DAY
94°F
W 11 mph
precip
3%
NIGHT
80°F
SW 6 mph
precip
14%
09.16
wed
DAY
90°F
SW 11 mph
precip
6%
NIGHT
76°F
SW 4 mph
precip
7%
09.17
thu
DAY
84°F
SW 9 mph
precip
12%
NIGHT
82°F
SW 5 mph
precip
22%
09.18
fri
DAY
86°F
W 6 mph
precip
58%
NIGHT
78°F
W 2 mph
precip
14%
09.19
sat
DAY
88°F
NW 4 mph
precip
47%
NIGHT
80°F
NW 4 mph
precip
26%
09.20
sun
DAY
88°F
E 2 mph
precip
57%
NIGHT
80°F
NW 3 mph
precip
21%
09.21
mon
DAY
94°F
NW 4 mph
precip
8%
NIGHT
78°F
N 3 mph
precip
26%

St. Simons Island Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for St. Simons Island was 29.3°F. The maximum and minimum values were 28.4°F and 30.0°F respectively.

St. Simons Island on the Weather Map

Best Time to Visit St. Simons Island
The most sunny months:
January 15 days
October 15 days
April 15 days
The most warm months:
July 93.4 °F
August 91.5 °F
June 90.3 °F
Warmest sea temperature:
August 89.0 °F
July 88.6 °F
September 85.5 °F
The most cold months:
January 60.4 °F
December 63.8 °F
February 65.7 °F
The most rainy months:
August 5 days
July 4 days
September 4 days
The most windy months:
February 7 mph
January 7 mph
April 7 mph
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