S
M
T
W
T
F
S
30
79°
64°
31
80°
63°
1
82°
62°
2
75°
59°
3
74°
60°
4
76°
61°
5
79°
61°
6
81°
62°
7
82°
63°
8
82°
63°
9
81°
62°
10
81°
61°
11
80°
61°
12
82°
63°
13
82°
62°
14
76°
51°
15
69°
53°
16
71°
57°
17
73°
56°
18
68°
50°
19
69°
48°
20
70°
50°
21
75°
55°
22
77°
56°
23
76°
47°
24
68°
49°
25
69°
51°
26
74°
56°
27
73°
54°
28
75°
46°
29
66°
44°
30
65°
45°
1
65°
51°
2
72°
50°
3
73°
52°
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 65° to 82°, with overnight lows between 44° and 64°. The average high for September is 75° with an average low of 56°. 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.
