S
M
T
W
T
F
S
30
77°
63°
31
81°
56°
1
81°
56°
2
83°
61°
3
80°
61°
4
81°
65°
5
83°
62°
6
78°
56°
7
76°
56°
8
76°
56°
9
72°
50°
10
71°
49°
11
75°
56°
12
75°
54°
13
71°
55°
14
70°
53°
15
63°
51°
16
63°
53°
17
71°
51°
18
70°
54°
19
73°
54°
20
73°
53°
21
68°
52°
22
66°
49°
23
60°
44°
24
59°
45°
25
66°
50°
26
65°
49°
27
70°
51°
28
69°
51°
29
70°
50°
30
65°
49°
1
66°
47°
2
64°
47°
3
59°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cass Lake
Cass Lake's September 2026 forecast shows daily high temperatures ranging from 59° to 83°, with overnight lows between 44° and 65°. The average high for September is 71° with an average low of 53°. 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 Lake. See also: October | November | December.
