S
M
T
W
T
F
S
30
75°
63°
31
78°
56°
1
81°
56°
2
80°
64°
3
80°
63°
4
81°
65°
5
80°
62°
6
70°
55°
7
69°
53°
8
72°
52°
9
71°
50°
10
77°
58°
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 81°, with overnight lows between 44° and 65°. The average high for September is 70° 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.
