S
M
T
W
T
F
S
30
91°
67°
31
90°
69°
1
90°
66°
2
89°
65°
3
88°
68°
4
89°
64°
5
88°
67°
6
89°
68°
7
88°
67°
8
87°
66°
9
88°
67°
10
88°
67°
11
87°
66°
12
86°
66°
13
82°
65°
14
82°
65°
15
83°
64°
16
84°
64°
17
82°
62°
18
82°
60°
19
81°
63°
20
81°
58°
21
80°
57°
22
80°
58°
23
81°
59°
24
82°
61°
25
83°
62°
26
82°
61°
27
83°
61°
28
78°
59°
29
82°
55°
30
Hist. Avg.
79°
56°
1
Hist. Avg.
79°
55°
2
Hist. Avg.
79°
55°
3
Hist. Avg.
78°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Valley
Valley's September 2026 forecast shows daily high temperatures ranging from 78° to 91°, with overnight lows between 55° and 69°. 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.
