Average Temperatures for California Cities in September

Average daily high and low temperatures for September at dozens of cities throughout California are listed below in degrees Fahrenheit and Celsius.

You can jump to separate tables for cities in Southern California and Northern California.

The tables give the normal maximum and minimum temperatures based on weather data collected from 1991 to 2020 by the US National Centers for Environmental Information.

Northern California

September temperature averages
High °F	Low °F	Place	High °C	Low °C
87	59	Antioch	30	15
76	54	Berkeley	25	12
91	55	Chico	33	13
85	50	Clearlake	30	10
86	58	Concord	30	14
90	55	Davis	32	13
64	51	Eureka	18	10
87	57	Fairfield	31	14
78	56	Fremont	26	13
91	63	Fresno	33	17
82	52	Grass Valley	28	11
77	58	Hayward	25	14
86	55	Livermore	30	13
89	58	Madera	32	15
89	56	Merced	32	13
89	59	Modesto	32	15
84	53	Napa	29	12
77	58	Newark	25	14
75	57	Oakland	24	14

High °F	Low °F	Place	High °C	Low °C
80	53	Palo Alto	26	12
82	51	Petaluma	28	11
92	62	Porterville	34	17
91	59	Red Bluff	33	15
92	58	Redding	34	15
79	54	Redwood City	26	12
75	56	Richmond	24	13
89	59	Sacramento	32	15
70	56	San Francisco	21	13
81	57	San Jose	27	14
81	54	San Rafael	27	12
84	51	Santa Rosa	29	11
87	51	Sonora	30	10
92	57	Stockton	33	14
89	60	Tracy	32	16
88	62	Turlock	31	17
87	51	Ukiah	31	11
92	58	Vacaville	33	14
86	57	Vallejo	30	14
74	53	Watsonville	23	12
90	56	Woodland	32	13
90	56	Yuba City	32	13

Southern California

Average September temperatures
High °F	Low °F	Place	High °C	Low °C
88	64	Anaheim	31	18
91	65	Bakersfield	33	18
87	61	Burbank	30	16
77	64	Chula Vista	25	18
102	73	El Centro	39	23
87	63	Escondido	31	17
85	65	Fullerton	30	18
92	59	Hanford	33	15
89	62	Irvine	32	17
91	57	Lancaster	33	14
82	64	Long Beach	28	18
83	64	Los Angeles	28	18
71	64	Oceanside	22	18
91	64	Ontario	33	18
74	60	Oxnard	23	15
93	60	Palmdale	34	16
90	62	Pasadena	32	16
89	60	Pomona	32	16
91	62	Riverside	33	17
74	54	Salinas	24	12
77	66	San Diego	25	19
80	54	San Luis Obispo	27	12
84	64	Santa Ana	29	18
78	60	Santa Barbara	25	15
77	53	Santa Cruz	25	12
78	61	Torrance	26	16
91	58	Victorville	33	14
88	60	Visalia	31	16

Average September Temperatures at Cities in California

Northern California

Southern California

Reference

More California Weather Information