S
M
T
W
T
F
S
30
89°
65°
31
87°
72°
1
97°
70°
2
86°
71°
3
90°
71°
4
90°
72°
5
81°
67°
6
80°
64°
7
80°
62°
8
N/A
9
87°
70°
10
91°
70°
11
80°
66°
12
80°
70°
13
86°
74°
14
84°
72°
15
85°
73°
16
83°
68°
17
79°
68°
18
79°
65°
19
80°
62°
20
76°
63°
21
75°
62°
22
80°
66°
23
75°
67°
24
75°
66°
25
76°
65°
26
80°
66°
27
79°
65°
28
79°
65°
29
78°
64°
30
79°
65°
1
78°
64°
2
77°
64°
3
78°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in California
California's September 2026 forecast shows daily high temperatures ranging from 75° to 91°, with overnight lows between 62° and 74°. The average high for September is 80° with an average low of 66°. 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 California. See also: October | November | December.
