S
M
T
W
T
F
S
30
89°
76°
31
89°
76°
1
88°
75°
2
88°
76°
3
87°
76°
4
83°
74°
5
84°
75°
6
84°
72°
7
83°
71°
8
85°
73°
9
84°
75°
10
86°
75°
11
86°
74°
12
85°
75°
13
85°
74°
14
85°
70°
15
86°
73°
16
86°
74°
17
87°
73°
18
82°
69°
19
86°
70°
20
81°
72°
21
81°
70°
22
82°
69°
23
81°
69°
24
84°
70°
25
85°
71°
26
80°
69°
27
80°
67°
28
82°
69°
29
79°
71°
30
81°
70°
1
79°
70°
2
79°
69°
3
80°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Saint Simons Island
Saint Simons Island's September 2026 forecast shows daily high temperatures ranging from 79° to 89°, with overnight lows between 67° and 76°. The average high for September is 84° with an average low of 72°. 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 Saint Simons Island. See also: October | November | December.
