San Francisco September 21 Weather Records

Year	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
2023	70	56	0.00	n/a
2022	69	60	0.01	n/a
2021	84	62	0.00	n/a
2020	71	57	0.00	n/a
2019	84	60	0.00	n/a
2018	64	54	0.00	n/a
2017	64	55	0.00	0.0
2016	64	55	0.00	n/a
2015	89	61	0.00	n/a
2014	67	62	0.00	n/a
2013	67	58	0.39	n/a
2012	66	52	0.00	0.0
2011	74	54	0.00	0.0
2010	63	56	0.00	0.0
2009	66	55	0.00	n/a
2008	65	57	0.00	n/a
2007	70	57	0.00	0.0
2006	70	55	0.00	n/a
2005	61	54	0.00	n/a
2004	76	54	0.00	n/a
2003	97	59	0.00	n/a
2002	65	53	0.00	n/a
2001	65	51	0.00	0.0
2000	70	60	0.00	n/a
1999	68	54	0.00	0.0
1998	64	55	0.00	n/a
1997	74	57	0.00	n/a
1996	75	56	0.00	n/a
1995	67	56	0.00	n/a
1994	68	56	0.00	n/a
1993	67	53	0.00	n/a
1992	72	55	0.00	n/a
1991	77	55	0.00	n/a
1990	76	60	0.00	n/a
1989	79	54	0.00	n/a
1988	66	53	0.00	n/a
1987	76	54	0.00	n/a
1986	67	55	0.00	n/a
1985	75	55	0.00	n/a
1984	80	55	0.00	n/a
1983	83	63	0.00	n/a
1982	80	54	0.00	n/a
1981	76	55	0.00	n/a
1980	73	55	0.00	n/a
1979	68	57	0.00	n/a
1978	73	54	0.00	n/a
1977	74	57	0.00	n/a
1976	66	54	0.00	n/a
1975	60	52	0.00	n/a
1974	57	52	0.00	n/a
1973	67	56	0.00	n/a
1972	78	58	0.00	0.0
1971	66	56	0.00	0.0
1970	75	53	0.00	0.0
1969	70	56	0.00	0.0
1968	70	55	0.00	0.0
1967	73	61	0.00	0.0
1966	69	60	0.00	0.0
1965	67	52	0.00	0.0
1964	82	69	0.00	0.0
1963	66	55	0.00	0.0
1962	66	53	0.00	0.0
1961	65	55	0.00	0.0
1960	66	53	0.00	0.0
1959	75	58	0.00	0.0
1958	80	58	0.00	0.0
1957	79	54	0.00	0.0
1956	78	56	0.00	0.0
1955	67	51	0.00	0.0
1954	64	52	0.00	0.0
1953	70	59	0.00	0.0
1952	69	54	0.00	0.0
1951	61	52	0.00	0.0
1950	85	56	0.00	0.0
1949	87	61	0.00	0.0
1948	66	54	0.00	0.0
1947	90	64	0.00	0.0
1946	76	56	0.00	0.0
1945	63	55	0.02	0.0
1944	69	58	0.00	0.0
1943	96	66	0.00	0.0
1942	61	54	0.00	0.0
1941	79	58	0.00	0.0
1940	69	57	0.00	0.0
1939	97	74	0.00	0.0
1938	62	52	0.00	0.0
1937	67	55	0.00	0.0
1936	61	53	0.00	0.0
1935	64	53	0.00	0.0
1934	67	56	0.00	0.0
1933	69	56	0.00	0.0
1932	65	56	0.00	0.0
1931	82	56	0.00	0.0
1930	68	60	0.00	0.0
1929	68	54	0.00	0.0
1928	99	65	0.00	0.0
1927	68	55	0.00	0.0
1926	73	55	0.00	0.0
1925	76	57	0.00	0.0
1924	80	56	0.00	0.0
1923	72	59	0.01	0.0
1922	66	54	0.00	0.0
1921	76	57	0.00	0.0

What's the all-time high for San Francisco on 9/21?

For the date of Sep 21, the highest temperature ever reached in San Francisco history is 99 °F which happened in 1928.

Highest Temperatures in San Francisco on September 21

Rank	Temperature	Year
1	99 °F	1928
2	97 °F	1939
2	97 °F	2003
4	96 °F	1943
5	90 °F	1947
6	89 °F	2015
7	87 °F	1949
8	85 °F	1950
9	84 °F	2019
9	84 °F	2021

What's the all-time low for San Francisco on 9/21?

For the date of Sep 21, the lowest temperature ever reached in San Francisco history is 51 °F which has happened 2 times, most recently in 2001.

Lowest Temperatures in San Francisco on September 21

Rank	Temperature	Year
1	51 °F	1955
1	51 °F	2001
3	52 °F	1951
3	52 °F	1975
3	52 °F	2012
3	52 °F	1974
3	52 °F	1954
3	52 °F	1938
3	52 °F	1965
10	53 °F	1962
10	53 °F	1960
10	53 °F	1970
10	53 °F	1993
10	53 °F	1935
10	53 °F	1988
10	53 °F	2002
10	53 °F	1936

Lowest High Temperatures in San Francisco on September 21

Rank	Temperature	Year
1	57 °F	1974
2	60 °F	1975
3	61 °F	2005
3	61 °F	1951
3	61 °F	1942
3	61 °F	1936
7	62 °F	1938
8	63 °F	2010
8	63 °F	1945
10	64 °F	1935
10	64 °F	2018
10	64 °F	2016
10	64 °F	1998
10	64 °F	1954
10	64 °F	2017

What's the most it has ever rained in San Francisco on 9/21?

For the date of Sep 21, the most precipitation ever recorded in San Francisco history is 0.39 inches which happened in 2013.

All-Time Most Precipitation in San Francisco on September 21

Rank	Precipitation	Year
1	0.39 inches	2013
2	0.02 inches	1945
3	0.01 inches	2022
3	0.01 inches	1923

Weather Station Details

Years	Station	Coordinates
1921–2024	Downtown San Francisco	location