S
M
T
W
T
F
S
30
86°
66°
31
89°
67°
1
89°
67°
2
88°
66°
3
89°
66°
4
89°
65°
5
88°
65°
6
88°
63°
7
86°
58°
8
78°
61°
9
79°
63°
10
78°
64°
11
85°
63°
12
84°
64°
13
86°
63°
14
85°
57°
15
84°
61°
16
75°
55°
17
76°
53°
18
75°
56°
19
77°
51°
20
74°
51°
21
73°
52°
22
74°
58°
23
78°
58°
24
81°
59°
25
81°
59°
26
80°
57°
27
81°
58°
28
79°
54°
29
78°
53°
30
77°
53°
1
76°
52°
2
79°
55°
3
71°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in California
California's September 2026 forecast shows daily high temperatures ranging from 71° to 89°, with overnight lows between 46° and 67°. The average high for September is 81° with an average low of 59°. 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.
