S
M
T
W
T
F
S
30
98°
76°
31
99°
77°
1
101°
74°
2
98°
73°
3
97°
73°
4
96°
72°
5
95°
72°
6
96°
74°
7
96°
73°
8
95°
72°
9
93°
71°
10
93°
71°
11
94°
73°
12
98°
74°
13
99°
75°
14
100°
69°
15
91°
69°
16
90°
70°
17
91°
69°
18
96°
70°
19
97°
71°
20
97°
73°
21
96°
74°
22
98°
73°
23
98°
76°
24
96°
74°
25
88°
68°
26
86°
68°
27
85°
71°
28
87°
70°
29
90°
69°
30
89°
68°
1
83°
67°
2
81°
66°
3
93°
68°
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 81° to 101°, with overnight lows between 66° and 77°. The average high for September is 94° with an average low of 72°. 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.
