S
M
T
W
T
F
S
30
83°
75°
31
86°
75°
1
86°
75°
2
91°
75°
3
90°
77°
4
90°
77°
5
91°
77°
6
91°
75°
7
88°
75°
8
84°
73°
9
88°
75°
10
88°
77°
11
90°
75°
12
88°
73°
13
93°
77°
14
93°
79°
15
86°
77°
16
86°
70°
17
86°
68°
18
91°
70°
19
88°
74°
20
81°
72°
21
84°
74°
22
83°
72°
23
82°
67°
24
79°
66°
25
80°
62°
26
81°
63°
27
83°
63°
28
81°
64°
29
80°
65°
30
79°
68°
1
78°
68°
2
81°
65°
3
82°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Seabrook Island
Seabrook Island's September 2026 forecast shows daily high temperatures ranging from 78° to 88°, with overnight lows between 62° and 74°. The average high for September is 81° with an average low of 68°. 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 Seabrook Island. See also: October | November | December.
