S
M
T
W
T
F
S
30
88°
71°
31
84°
70°
1
85°
70°
2
84°
69°
3
85°
70°
4
86°
69°
5
85°
67°
6
85°
66°
7
84°
69°
8
85°
68°
9
85°
68°
10
83°
67°
11
82°
66°
12
84°
66°
13
84°
65°
14
83°
66°
15
84°
67°
16
81°
67°
17
83°
68°
18
83°
66°
19
81°
62°
20
78°
64°
21
76°
67°
22
78°
58°
23
77°
58°
24
73°
59°
25
74°
61°
26
77°
62°
27
72°
60°
28
72°
59°
29
71°
57°
30
72°
60°
1
72°
64°
2
74°
54°
3
72°
53°
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 88°, with overnight lows between 53° and 71°. The average high for September is 80° with an average low of 64°. 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.
