S
M
T
W
T
F
S
30
88°
77°
31
84°
77°
1
88°
77°
2
88°
77°
3
90°
79°
4
86°
79°
5
93°
77°
6
93°
77°
7
86°
77°
8
88°
82°
9
88°
79°
10
88°
75°
11
88°
77°
12
88°
75°
13
91°
77°
14
90°
79°
15
90°
79°
16
86°
79°
17
86°
81°
18
88°
73°
19
88°
75°
20
82°
75°
21
86°
75°
22
88°
75°
23
84°
73°
24
75°
64°
25
77°
64°
26
81°
59°
27
86°
63°
28
86°
68°
29
84°
70°
30
86°
72°
1
86°
79°
2
88°
75°
3
86°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Simons
St. Simons's September 2026 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.
