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
73°
50°
17
66°
56°
18
64°
55°
19
66°
56°
20
66°
49°
21
62°
48°
22
60°
45°
23
66°
45°
24
67°
48°
25
69°
48°
26
68°
52°
27
68°
51°
28
67°
52°
29
67°
48°
30
69°
48°
1
67°
49°
2
66°
44°
3
63°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cascade Mountain
Cascade Mountain's September 2026 forecast shows daily high temperatures ranging from 60° to 69°, with overnight lows between 44° and 56°. The average high for September is 66° with an average low of 49°. 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.
