S
M
T
W
T
F
S
30
77°
56°
31
80°
57°
1
82°
52°
2
78°
46°
3
72°
55°
4
74°
56°
5
76°
46°
6
79°
42°
7
69°
44°
8
71°
48°
9
70°
52°
10
74°
53°
11
77°
52°
12
77°
45°
13
74°
42°
14
68°
40°
15
65°
41°
16
67°
41°
17
68°
47°
18
74°
39°
19
67°
39°
20
64°
47°
21
67°
50°
22
74°
41°
23
73°
49°
24
72°
50°
25
73°
49°
26
74°
46°
27
71°
39°
28
65°
40°
29
59°
43°
30
59°
41°
1
64°
42°
2
60°
47°
3
58°
33°
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 58° to 82°, with overnight lows between 33° and 57°. The average high for September is 71° with an average low of 46°. 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.
