S
M
T
W
T
F
S
30
82°
56°
31
82°
45°
1
81°
45°
2
70°
43°
3
68°
43°
4
68°
45°
5
69°
45°
6
74°
53°
7
79°
48°
8
80°
43°
9
74°
45°
10
72°
43°
11
69°
52°
12
73°
42°
13
70°
39°
14
65°
44°
15
67°
51°
16
73°
46°
17
70°
41°
18
66°
48°
19
72°
41°
20
72°
37°
21
64°
41°
22
62°
52°
23
74°
41°
24
74°
41°
25
71°
47°
26
62°
47°
27
65°
44°
28
70°
48°
29
68°
49°
30
70°
40°
1
72°
35°
2
67°
35°
3
57°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Casselton
Casselton's September 2026 forecast shows daily high temperatures ranging from 57° to 82°, with overnight lows between 35° and 56°. The average high for September is 71° with an average low of 44°. 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 Casselton. See also: October | November | December.
