S
M
T
W
T
F
S
30
84°
75°
31
84°
73°
1
90°
74°
2
88°
76°
3
86°
76°
4
89°
76°
5
92°
75°
6
89°
72°
7
85°
71°
8
89°
72°
9
88°
70°
10
88°
70°
11
88°
72°
12
86°
68°
13
84°
69°
14
87°
70°
15
87°
73°
16
86°
72°
17
86°
72°
18
83°
71°
19
82°
71°
20
80°
70°
21
81°
71°
22
82°
71°
23
80°
70°
24
82°
70°
25
81°
69°
26
78°
69°
27
79°
70°
28
80°
70°
29
79°
69°
30
78°
69°
1
78°
68°
2
79°
69°
3
78°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Hilton Head Island
Hilton Head Island's September 2026 forecast shows daily high temperatures ranging from 78° to 92°, with overnight lows between 68° and 76°. The average high for September is 84° with an average low of 71°. 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 Hilton Head Island. See also: October | November | December.
