S
M
T
W
T
F
S
30
93°
71°
31
91°
67°
1
87°
63°
2
87°
61°
3
84°
59°
4
85°
62°
5
95°
59°
6
90°
72°
7
100°
75°
8
103°
78°
9
107°
80°
10
100°
78°
11
97°
73°
12
89°
68°
13
87°
67°
14
87°
65°
15
82°
64°
16
81°
65°
17
81°
64°
18
81°
64°
19
84°
64°
20
82°
64°
21
78°
67°
22
83°
57°
23
88°
60°
24
86°
60°
25
88°
59°
26
90°
59°
27
91°
57°
28
88°
56°
29
94°
56°
30
95°
55°
1
96°
57°
2
87°
51°
3
83°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Valley Center
Valley Center's September 2026 forecast shows daily high temperatures ranging from 83° to 96°, with overnight lows between 51° and 60°. The average high for September is 89° with an average low of 57°. 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 Center. See also: October | November | December.
