S
M
T
W
T
F
S
30
88°
68°
31
88°
66°
1
83°
64°
2
84°
67°
3
88°
63°
4
89°
68°
5
89°
68°
6
87°
67°
7
88°
62°
8
82°
61°
9
82°
61°
10
83°
62°
11
85°
61°
12
86°
62°
13
85°
65°
14
86°
62°
15
85°
65°
16
85°
65°
17
84°
58°
18
80°
57°
19
77°
58°
20
77°
64°
21
78°
58°
22
78°
59°
23
79°
61°
24
77°
62°
25
78°
61°
26
81°
62°
27
82°
61°
28
80°
59°
29
76°
60°
30
76°
59°
1
75°
60°
2
76°
54°
3
75°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fort Mill
Fort Mill's September 2026 forecast shows daily high temperatures ranging from 75° to 89°, with overnight lows between 52° and 68°. The average high for September is 82° with an average low of 62°. 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 Mill. See also: October | November | December.
