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°
71°
24
83°
66°
25
80°
62°
26
79°
64°
27
82°
66°
28
86°
71°
29
86°
71°
30
84°
72°
1
85°
74°
2
84°
68°
3
84°
72°
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 88°, with overnight lows between 62° and 75°. The average high for September is 84° with an average low of 69°. 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.
