S
M
T
W
T
F
S
30
83°
75°
31
86°
75°
1
86°
75°
2
87°
77°
3
90°
78°
4
89°
76°
5
93°
74°
6
88°
73°
7
84°
72°
8
84°
73°
9
89°
72°
10
92°
74°
11
93°
72°
12
87°
73°
13
85°
73°
14
88°
72°
15
86°
73°
16
85°
72°
17
85°
74°
18
82°
75°
19
80°
75°
20
84°
74°
21
83°
74°
22
84°
73°
23
84°
74°
24
83°
74°
25
80°
73°
26
83°
74°
27
83°
73°
28
82°
66°
29
76°
65°
30
76°
65°
1
78°
71°
2
79°
70°
3
80°
71°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in James Island
James Island's September 2026 forecast shows daily high temperatures ranging from 76° to 93°, with overnight lows between 65° and 78°. The average high for September is 84° with an average low of 73°. 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 James Island. See also: October | November | December.
