S
M
T
W
T
F
S
30
71°
57°
31
78°
60°
1
77°
60°
2
81°
59°
3
81°
61°
4
74°
59°
5
71°
54°
6
72°
53°
7
77°
51°
8
72°
55°
9
72°
56°
10
75°
56°
11
67°
45°
12
80°
44°
13
78°
62°
14
65°
44°
15
68°
41°
16
79°
57°
17
68°
51°
18
67°
47°
19
62°
37°
20
64°
42°
21
59°
47°
22
62°
40°
23
66°
36°
24
67°
34°
25
74°
46°
26
74°
51°
27
69°
56°
28
67°
52°
29
67°
52°
30
71°
53°
1
74°
53°
2
74°
39°
3
66°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Casselman
Casselman's September 2026 forecast shows daily high temperatures ranging from 66° to 74°, with overnight lows between 39° and 56°. 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 Casselman. See also: October | November | December.
