S
M
T
W
T
F
S
30
72°
50°
31
73°
57°
1
77°
57°
2
78°
59°
3
77°
54°
4
77°
48°
5
74°
48°
6
69°
47°
7
70°
51°
8
74°
52°
9
76°
56°
10
78°
50°
11
74°
48°
12
70°
54°
13
69°
47°
14
71°
48°
15
67°
51°
16
69°
52°
17
68°
51°
18
72°
44°
19
68°
47°
20
68°
44°
21
70°
43°
22
66°
48°
23
66°
50°
24
73°
52°
25
74°
50°
26
72°
52°
27
71°
51°
28
74°
48°
29
71°
44°
30
65°
51°
1
70°
45°
2
72°
40°
3
67°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cass City
Cass City's September 2026 forecast shows daily high temperatures ranging from 65° to 78°, with overnight lows between 39° and 59°. The average high for September is 71° with an average low of 49°. 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 Cass City. See also: October | November | December.
