S
M
T
W
T
F
S
30
90°
71°
31
92°
69°
1
87°
65°
2
85°
63°
3
82°
60°
4
82°
65°
5
94°
63°
6
90°
77°
7
104°
76°
8
101°
78°
9
108°
79°
10
91°
72°
11
84°
68°
12
82°
65°
13
82°
64°
14
77°
62°
15
76°
62°
16
77°
64°
17
79°
64°
18
81°
62°
19
82°
60°
20
80°
62°
21
76°
64°
22
83°
63°
23
84°
60°
24
84°
63°
25
89°
63°
26
94°
62°
27
84°
72°
28
84°
63°
29
86°
61°
30
90°
66°
1
88°
65°
2
98°
72°
3
100°
72°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Spring Valley
Spring Valley's September 2026 forecast shows daily high temperatures ranging from 88° to 100°, with overnight lows between 65° and 72°. The average high for September is 95° with an average low of 70°. 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 Spring Valley. See also: October | November | December.
