S
M
T
W
T
F
S
30
83°
59°
31
83°
58°
1
79°
58°
2
79°
62°
3
78°
61°
4
78°
62°
5
82°
62°
6
83°
61°
7
82°
57°
8
79°
55°
9
77°
55°
10
80°
56°
11
81°
56°
12
81°
58°
13
80°
61°
14
79°
60°
15
Hist. Avg.
77°
56°
16
Hist. Avg.
77°
56°
17
Hist. Avg.
77°
55°
18
Hist. Avg.
76°
55°
19
Hist. Avg.
76°
55°
20
Hist. Avg.
76°
54°
21
Hist. Avg.
75°
54°
22
Hist. Avg.
75°
54°
23
Hist. Avg.
75°
53°
24
Hist. Avg.
74°
53°
25
Hist. Avg.
74°
52°
26
Hist. Avg.
74°
52°
27
Hist. Avg.
73°
52°
28
Hist. Avg.
73°
51°
29
Hist. Avg.
73°
51°
30
Hist. Avg.
72°
50°
1
Hist. Avg.
72°
50°
2
Hist. Avg.
72°
50°
3
Hist. Avg.
72°
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 77° to 83°, with overnight lows between 55° and 62°. The average high for September is 80° with an average low of 59°. 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.
