S
M
T
W
T
F
S
30
86°
67°
31
87°
68°
1
89°
69°
2
90°
69°
3
89°
71°
4
90°
71°
5
90°
66°
6
85°
66°
7
86°
70°
8
85°
69°
9
84°
68°
10
85°
69°
11
88°
68°
12
88°
69°
13
87°
68°
14
88°
69°
15
88°
69°
16
87°
68°
17
87°
68°
18
86°
67°
19
86°
63°
20
85°
62°
21
85°
65°
22
84°
66°
23
84°
65°
24
86°
61°
25
85°
59°
26
84°
63°
27
83°
64°
28
83°
61°
29
81°
62°
30
82°
63°
1
83°
62°
2
83°
62°
3
78°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fort Jackson
Fort Jackson's September 2026 forecast shows daily high temperatures ranging from 78° to 90°, with overnight lows between 59° and 71°. The average high for September is 86° with an average low of 66°. 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 Fort Jackson. See also: October | November | December.
