S
M
T
W
T
F
S
30
79°
57°
31
81°
48°
1
71°
49°
2
70°
56°
3
69°
57°
4
76°
48°
5
76°
45°
6
67°
47°
7
69°
54°
8
73°
51°
9
67°
48°
10
66°
53°
11
66°
50°
12
65°
44°
13
64°
43°
14
64°
45°
15
65°
51°
16
64°
54°
17
71°
52°
18
70°
48°
19
67°
49°
20
63°
45°
21
65°
46°
22
62°
44°
23
59°
39°
24
61°
42°
25
61°
42°
26
63°
42°
27
Hist. Avg.
64°
44°
28
Hist. Avg.
63°
44°
29
Hist. Avg.
63°
43°
30
Hist. Avg.
62°
42°
1
Hist. Avg.
62°
42°
2
Hist. Avg.
61°
42°
3
Hist. Avg.
60°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Cass Lake
Cass Lake's September 2026 forecast shows daily high temperatures ranging from 59° to 81°, with overnight lows between 39° and 57°. The average high for September is 68° with an average low of 48°. 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.
