S
M
T
W
T
F
S
30
89°
70°
31
91°
68°
1
93°
68°
2
95°
70°
3
97°
72°
4
95°
70°
5
93°
70°
6
95°
72°
7
88°
70°
8
90°
72°
9
91°
64°
10
91°
68°
11
88°
70°
12
90°
72°
13
92°
66°
14
96°
68°
15
94°
72°
16
90°
62°
17
90°
63°
18
88°
66°
19
87°
66°
20
86°
65°
21
83°
62°
22
80°
60°
23
79°
61°
24
81°
60°
25
81°
60°
26
80°
59°
27
83°
61°
28
84°
63°
29
83°
62°
30
83°
62°
1
82°
61°
2
83°
61°
3
84°
60°
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 79° to 96°, with overnight lows between 59° and 72°. The average high for September is 85° with an average low of 63°. 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.
