S
M
T
W
T
F
S
30
77°
54°
31
76°
50°
1
77°
49°
2
72°
53°
3
71°
50°
4
76°
47°
5
70°
46°
6
69°
52°
7
74°
52°
8
74°
50°
9
75°
51°
10
74°
50°
11
73°
49°
12
72°
45°
13
72°
50°
14
71°
49°
15
72°
48°
16
71°
44°
17
65°
44°
18
66°
48°
19
70°
47°
20
70°
46°
21
69°
46°
22
63°
44°
23
66°
46°
24
68°
45°
25
64°
44°
26
61°
40°
27
60°
44°
28
66°
42°
29
65°
40°
30
59°
39°
1
60°
41°
2
60°
38°
3
58°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Valley
Valley's September 2026 forecast shows daily high temperatures ranging from 58° to 77°, with overnight lows between 37° and 54°. The average high for September is 69° 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 Valley. See also: October | November | December.
