S
M
T
W
T
F
S
30
79°
48°
31
81°
52°
1
87°
58°
2
89°
59°
3
89°
53°
4
82°
46°
5
77°
47°
6
79°
53°
7
79°
51°
8
83°
50°
9
81°
51°
10
80°
46°
11
78°
46°
12
79°
50°
13
77°
44°
14
75°
42°
15
72°
41°
16
73°
40°
17
73°
41°
18
74°
43°
19
76°
48°
20
83°
45°
21
81°
43°
22
75°
42°
23
71°
40°
24
68°
39°
25
66°
39°
26
67°
38°
27
69°
39°
28
71°
43°
29
73°
41°
30
76°
43°
1
Hist. Avg.
72°
42°
2
Hist. Avg.
71°
42°
3
Hist. Avg.
70°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cascade Valley
Cascade Valley's September 2026 forecast shows daily high temperatures ranging from 66° to 89°, with overnight lows between 38° and 59°. The average high for September is 77° with an average low of 46°. 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 Valley. See also: October | November | December.
