California September Temperature by Year

This page is a list of the average statewide temperature in the month of September in California for each year from 1895–2023. It is a statewide average over the entire territory of the state, based on data from the NOAA.

State:

Month:

What Was the Hottest September in California History?

2020 was the warmest September in California history. Statewide, the average daily high temperature was 88.8 °F, and the average low was 59.1 °F.

What Was the Coldest September in California History?

1986 was the coolest September in California history. Statewide, the average daily high temperature was 75.8 °F, and the average low was 51.1 °F.

Click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	81	80.9	55.0
2022	2	87.0	60.0
2021	6	86.7	57.7
2020	1	88.8	59.1
2019	68	82.5	55.3
2018	19	86.0	56.1
2017	46	83.1	56.6
2016	52	84.2	54.8
2015	12	86.2	58.0
2014	6	86.2	58.3
2013	58	83.1	55.6
2012	3	88.3	57.8
2011	6	87.2	57.3
2010	36	86.0	54.9
2009	4	88.4	57.6
2008	13	87.3	56.3
2007	89	81.5	53.6
2006	52	84.8	54.2
2005	100	81.7	52.0
2004	55	84.5	54.2
2003	5	88.0	57.7
2002	23	86.0	55.8
2001	17	86.1	56.4
2000	62	83.6	54.6
1999	31	85.6	55.8
1998	61	82.3	56.1
1997	26	84.3	57.2
1996	76	82.8	54.0
1995	17	85.9	56.5
1994	46	84.3	55.4
1993	52	84.9	54.0
1992	26	85.7	55.8
1991	6	87.0	57.4
1990	44	84.1	55.7
1989	79	82.4	53.9
1988	55	84.7	54.2
1987	46	84.8	54.8
1986	129	75.8	51.1
1985	125	76.8	51.9
1984	6	86.5	57.9
1983	20	84.2	57.8
1982	98	79.6	54.6
1981	36	84.6	56.3
1980	73	83.2	54.0
1979	6	87.6	56.7
1978	106	80.0	53.4
1977	86	81.0	54.5
1976	81	80.2	55.8
1975	20	85.5	56.4
1974	13	87.3	56.2
1973	89	81.9	53.1
1972	108	80.1	53.1
1971	75	83.1	53.9
1970	87	83.6	51.8
1969	23	85.4	56.4
1968	62	84.2	54.0
1967	26	84.2	57.4
1966	65	83.5	54.6
1965	124	78.8	50.5
1964	100	82.2	51.7
1963	31	84.4	57.0
1962	51	84.6	54.4
1961	108	81.3	51.9
1960	26	86.4	55.2
1959	96	80.6	53.8
1958	36	85.2	55.6
1957	58	84.0	54.6
1956	40	85.8	54.8
1955	58	85.0	53.7
1954	92	83.0	51.8
1953	20	86.3	55.6
1952	34	85.6	55.6
1951	31	86.4	54.9
1950	87	81.4	54.0
1949	40	85.6	54.8
1948	77	83.6	52.9
1947	26	86.8	54.8
1946	73	84.1	53.2
1945	46	85.0	54.5
1944	50	85.6	53.8
1943	15	87.3	55.2
1942	89	83.1	51.9
1941	123	79.8	49.9
1940	108	79.8	53.4
1939	62	82.7	55.4
1938	36	85.2	55.6
1937	44	85.2	54.6
1936	65	85.1	53.0
1935	40	85.6	54.7
1934	55	84.9	53.8
1933	106	81.8	51.8
1932	23	87.3	54.5
1931	111	81.1	51.8
1930	121	78.6	51.5
1929	98	82.3	52.0
1928	68	85.2	52.6
1927	122	79.3	50.5
1926	118	81.2	49.7
1925	127	77.8	50.0
1924	77	84.4	52.2
1923	71	82.5	54.8
1922	15	87.8	54.9
1921	104	82.4	51.2
1920	115	80.2	51.8
1919	100	81.2	52.7
1918	81	80.5	55.5
1917	71	83.7	53.8
1916	104	81.6	52.0
1915	111	81.2	51.7
1914	114	80.4	52.1
1913	43	85.0	55.1
1912	116	79.7	51.8
1911	126	78.2	49.9
1910	92	82.1	52.7
1909	92	81.6	53.2
1908	95	81.8	52.7
1907	119	79.6	50.6
1906	81	82.6	53.4
1905	81	83.4	52.6
1904	70	82.1	55.4
1903	100	81.4	52.4
1902	65	84.5	53.6
1901	119	79.5	50.7
1900	128	77.8	49.8
1899	35	87.3	53.7
1898	79	82.4	53.8
1897	96	80.3	54.2
1896	111	79.7	53.1
1895	117	79.4	51.9