S
M
T
W
T
F
S
30
75°
68°
31
83°
71°
1
89°
74°
2
95°
73°
3
85°
68°
4
76°
68°
5
79°
63°
6
78°
60°
7
78°
59°
8
81°
69°
9
83°
64°
10
80°
55°
11
77°
60°
12
82°
64°
13
81°
61°
14
75°
65°
15
77°
58°
16
74°
56°
17
72°
55°
18
67°
50°
19
66°
51°
20
69°
50°
21
68°
53°
22
68°
58°
23
69°
57°
24
71°
57°
25
76°
56°
26
75°
56°
27
72°
56°
28
75°
58°
29
76°
58°
30
76°
57°
1
75°
56°
2
73°
52°
3
62°
48°
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 62° to 83°, with overnight lows between 48° and 69°. The average high for September is 74° 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.
