S
M
T
W
T
F
S
30
92°
70°
31
88°
65°
1
86°
59°
2
83°
60°
3
82°
62°
4
83°
63°
5
89°
62°
6
75°
65°
7
93°
70°
8
88°
73°
9
107°
83°
10
100°
77°
11
94°
70°
12
90°
66°
13
86°
64°
14
85°
64°
15
84°
66°
16
86°
65°
17
87°
66°
18
88°
68°
19
90°
67°
20
89°
67°
21
86°
65°
22
85°
66°
23
86°
67°
24
85°
62°
25
80°
61°
26
86°
62°
27
86°
63°
28
83°
60°
29
85°
62°
30
86°
65°
1
86°
65°
2
85°
64°
3
86°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in San Fernando Valley
San Fernando Valley's September 2026 forecast shows daily high temperatures ranging from 80° to 94°, with overnight lows between 60° and 70°. The average high for September is 86° with an average low of 65°. 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 San Fernando Valley. See also: October | November | December.
