S
M
T
W
T
F
S
30
76°
67°
31
87°
71°
1
87°
74°
2
94°
73°
3
94°
70°
4
80°
69°
5
80°
64°
6
78°
60°
7
80°
58°
8
88°
59°
9
88°
68°
10
84°
64°
11
82°
59°
12
78°
63°
13
83°
57°
14
71°
52°
15
86°
55°
16
83°
71°
17
75°
69°
18
76°
62°
19
71°
66°
20
73°
57°
21
66°
57°
22
66°
55°
23
64°
56°
24
65°
55°
25
67°
54°
26
68°
53°
27
68°
52°
28
69°
52°
29
67°
54°
30
68°
52°
1
68°
51°
2
67°
48°
3
65°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Flat Rock
Flat Rock's September 2026 forecast shows daily high temperatures ranging from 64° to 73°, with overnight lows between 48° and 66°. The average high for September is 67° with an average low of 54°. 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 Flat Rock. See also: October | November | December.
