S
M
T
W
T
F
S
30
77°
62°
31
85°
65°
1
86°
65°
2
83°
64°
3
77°
65°
4
77°
65°
5
75°
59°
6
76°
56°
7
76°
49°
8
72°
58°
9
83°
57°
10
77°
53°
11
80°
54°
12
79°
52°
13
69°
45°
14
66°
39°
15
75°
53°
16
N/A
17
69°
53°
18
69°
57°
19
70°
56°
20
64°
56°
21
62°
51°
22
65°
48°
23
66°
51°
24
70°
52°
25
71°
53°
26
73°
55°
27
70°
53°
28
72°
52°
29
69°
45°
30
69°
51°
1
71°
50°
2
62°
48°
3
63°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Cascade Mountain
Cascade Mountain's September 2026 forecast shows daily high temperatures ranging from 62° to 73°, with overnight lows between 45° and 57°. The average high for September is 68° with an average low of 52°. 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 Cascade Mountain. See also: October | November | December.
