S
M
T
W
T
F
S
30
86°
64°
31
85°
67°
1
85°
68°
2
86°
64°
3
82°
63°
4
81°
62°
5
82°
63°
6
85°
67°
7
85°
67°
8
84°
65°
9
84°
67°
10
85°
67°
11
84°
66°
12
84°
67°
13
83°
66°
14
83°
64°
15
80°
62°
16
79°
64°
17
82°
61°
18
78°
59°
19
81°
60°
20
80°
64°
21
81°
63°
22
78°
62°
23
79°
60°
24
80°
62°
25
79°
59°
26
75°
58°
27
Hist. Avg.
77°
57°
28
Hist. Avg.
77°
57°
29
Hist. Avg.
76°
56°
30
Hist. Avg.
76°
56°
1
Hist. Avg.
76°
56°
2
Hist. Avg.
75°
55°
3
Hist. Avg.
75°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Simpsonville
Simpsonville's September 2026 forecast shows daily high temperatures ranging from 75° to 86°, with overnight lows between 58° and 68°. The average high for September is 82° with an average low of 64°. 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 Simpsonville. See also: October | November | December.
