S
M
T
W
T
F
S
31
82°
72°
1
81°
72°
2
82°
68°
3
82°
70°
4
84°
68°
5
86°
72°
6
86°
73°
7
84°
75°
8
79°
75°
9
79°
70°
10
82°
64°
11
82°
68°
12
82°
70°
13
82°
68°
14
82°
68°
15
82°
66°
16
82°
66°
17
86°
68°
18
86°
70°
19
86°
73°
20
84°
73°
21
84°
72°
22
84°
77°
23
86°
73°
24
90°
73°
25
90°
77°
26
88°
73°
27
84°
75°
28
82°
73°
29
84°
73°
30
84°
73°
1
79°
68°
2
77°
72°
3
79°
70°
4
84°
72°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Simons
St. Simons's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in St. Simons. See also: October | November | December.
