Average September Temperature in San Francisco by Year

This page contains a list of the average monthly high and low temperatures in San Francisco, California for the month of September each year between 1921 and 2023. It is based on NOAA data.

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What Was the Hottest September Ever in San Francisco?

1984 was the warmest September in the history of San Francisco, California. The average daily high temperature was 81.2 °F, and the average low was 57.5 °F.

What Was the Coldest September Ever in San Francisco?

2012 was the coolest September in the history of San Francisco, California. The average daily high temperature was 64.0 °F, and the average low was 52.2 °F.

* click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	50	68.5	57.1
2022	13	72.3	58.0
2021	67	68.0	55.9
2020	11	73.0	58.1
2019	14	72.3	57.9
2018	91	66.3	54.6
2017	2	75.9	59.8
2016	65	69.2	55.2
2015	8	74.0	58.1
2014	22	69.9	59.2
2013	35	70.2	56.7
2012	103	64.0	52.2
2011	61	70.0	54.9
2010	43	71.3	55.0
2009	36	71.3	55.6
2008	40	71.0	55.7
2007	37	69.8	57.0
2006	99	66.6	52.6
2005	98	65.8	53.6
2004	16	73.3	56.5
2003	17	72.8	56.9
2002	73	69.5	53.6
2001	87	68.4	53.6
2000	19	72.3	57.1
1999	76	68.8	54.1
1998	72	67.9	55.6
1997	3	77.0	58.5
1996	30	71.9	55.2
1995	20	72.7	56.6
1994	28	71.4	55.9
1993	38	72.0	54.8
1992	10	74.9	56.6
1991	44	71.0	55.2
1990	9	74.1	57.8
1989	70	68.4	55.2
1988	46	72.2	53.9
1987	26	71.8	55.8
1986	53	69.0	56.5
1985	24	70.6	57.6
1984	1	81.2	57.5
1983	4	76.4	57.7
1982	55	69.9	55.2
1981	92	66.5	54.3
1980	81	67.6	55.0
1979	6	73.5	59.2
1978	12	73.6	57.4
1977	68	67.5	56.4
1976	66	67.8	56.5
1975	100	65.0	53.9
1974	93	66.5	54.1
1973	82	67.4	55.2
1972	75	66.9	56.1
1971	21	72.2	57.1
1970	23	73.1	55.7
1969	88	66.7	55.0
1968	45	69.3	56.8
1967	32	69.3	57.7
1966	31	70.2	56.9
1965	84	67.0	55.4
1964	62	69.1	55.8
1963	18	72.0	57.4
1962	102	63.4	53.2
1961	39	70.8	56.0
1960	96	66.7	52.9
1959	49	69.3	56.5
1958	5	75.0	58.6
1957	29	69.6	57.5
1956	56	69.9	55.2
1955	101	65.9	52.2
1954	71	68.7	54.9
1953	57	68.0	57.0
1952	74	69.2	53.8
1951	97	65.5	54.0
1950	69	68.8	55.0
1949	59	69.6	55.3
1948	95	66.9	53.0
1947	79	68.4	54.4
1946	51	70.4	55.1
1945	58	69.1	55.9
1944	89	68.0	53.3
1943	34	69.5	57.4
1942	94	65.5	55.0
1941	33	69.8	57.1
1940	15	70.8	59.2
1939	7	74.1	58.2
1938	83	68.0	54.3
1937	77	68.4	54.4
1936	47	71.0	55.0
1935	90	66.8	54.3
1934	27	72.4	55.0
1933	86	68.1	54.2
1932	48	70.7	55.2
1931	52	70.2	55.3
1930	63	67.8	57.0
1929	78	68.2	54.6
1928	80	69.0	53.7
1927	64	69.3	55.5
1926	85	68.4	53.9
1925	54	69.0	56.4
1924	60	70.4	54.5
1923	25	71.6	56.3
1922	41	71.6	55.0
1921	42	71.1	55.5

Weather Station Details

Years	Station	Coordinates
1921–2024	Downtown San Francisco	location