S
M
T
W
T
F
S
30
90°
70°
31
90°
69°
1
89°
70°
2
85°
70°
3
86°
69°
4
85°
69°
5
86°
68°
6
87°
69°
7
86°
68°
8
83°
65°
9
83°
63°
10
84°
64°
11
83°
66°
12
86°
67°
13
87°
67°
14
87°
62°
15
86°
61°
16
82°
60°
17
81°
61°
18
83°
62°
19
85°
61°
20
85°
60°
21
84°
64°
22
84°
65°
23
83°
62°
24
83°
59°
25
82°
58°
26
82°
58°
27
81°
61°
28
83°
62°
29
83°
62°
30
84°
61°
1
83°
61°
2
83°
62°
3
81°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Harleyville
Harleyville's September 2026 forecast shows daily high temperatures ranging from 81° to 90°, with overnight lows between 58° and 70°. The average high for September is 84° 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 Harleyville. See also: October | November | December.
