S
M
T
W
T
F
S
30
86°
63°
31
86°
57°
1
82°
57°
2
80°
56°
3
83°
57°
4
85°
62°
5
85°
61°
6
83°
58°
7
79°
56°
8
79°
60°
9
80°
55°
10
78°
54°
11
79°
53°
12
78°
55°
13
77°
54°
14
76°
53°
15
77°
54°
16
78°
56°
17
77°
57°
18
81°
57°
19
81°
57°
20
80°
58°
21
Hist. Avg.
78°
54°
22
Hist. Avg.
77°
54°
23
Hist. Avg.
77°
53°
24
Hist. Avg.
77°
53°
25
Hist. Avg.
76°
52°
26
Hist. Avg.
76°
52°
27
Hist. Avg.
76°
52°
28
Hist. Avg.
76°
51°
29
Hist. Avg.
75°
51°
30
Hist. Avg.
75°
50°
1
Hist. Avg.
75°
50°
2
Hist. Avg.
74°
49°
3
Hist. Avg.
74°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Flat Rock
Flat Rock's September 2026 forecast shows daily high temperatures ranging from 76° to 86°, with overnight lows between 53° and 63°. The average high for September is 80° with an average low of 57°. 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.
