S
M
T
W
T
F
S
30
85°
56°
31
85°
57°
1
86°
58°
2
84°
59°
3
85°
56°
4
84°
58°
5
88°
56°
6
83°
55°
7
88°
60°
8
89°
56°
9
87°
59°
10
86°
58°
11
84°
58°
12
85°
53°
13
82°
55°
14
83°
51°
15
79°
52°
16
79°
51°
17
80°
52°
18
84°
53°
19
84°
53°
20
82°
47°
21
Hist. Avg.
81°
56°
22
Hist. Avg.
80°
56°
23
Hist. Avg.
80°
56°
24
Hist. Avg.
80°
55°
25
Hist. Avg.
79°
55°
26
Hist. Avg.
79°
54°
27
Hist. Avg.
78°
54°
28
Hist. Avg.
78°
54°
29
Hist. Avg.
78°
53°
30
Hist. Avg.
77°
53°
1
Hist. Avg.
77°
52°
2
Hist. Avg.
76°
52°
3
Hist. Avg.
76°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in South Valley
South Valley's September 2026 forecast shows daily high temperatures ranging from 79° to 89°, with overnight lows between 47° and 60°. The average high for September is 84° with an average low of 55°. 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 South Valley. See also: October | November | December.
