S
M
T
W
T
F
S
30
92°
65°
31
87°
65°
1
83°
65°
2
91°
64°
3
89°
71°
4
86°
68°
5
91°
66°
6
93°
72°
7
93°
72°
8
93°
66°
9
92°
72°
10
94°
65°
11
95°
58°
12
94°
71°
13
94°
71°
14
85°
65°
15
78°
64°
16
75°
63°
17
82°
61°
18
76°
61°
19
77°
58°
20
82°
56°
21
83°
56°
22
76°
60°
23
61°
58°
24
73°
58°
25
78°
56°
26
83°
56°
27
83°
59°
28
75°
59°
29
72°
54°
30
70°
52°
1
77°
51°
2
81°
53°
3
80°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in South Valley
South Valley's September 2026 forecast shows daily high temperatures ranging from 70° to 83°, with overnight lows between 50° and 59°. The average high for September is 78° with an average low of 54°. 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.
