San Francisco September Precipitation Totals

A time series of total precipitation in the month of September in San Francisco, California from 1921–2023.

Rainiest September in San Francisco History

The rainiest September in San Francisco, California history happened in 1959, with 2.06 inches of total precipitation.

Driest September in San Francisco History

There have been 39 times where no rain was recorded in San Francisco, California for the entire month of September. The most recent time this happened was 2020.

San Francisco Average September Precipitation by Year

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Year	Precipitation (inches)
2023	0.11
2022	0.34
2021	0.07
2020	0.00
2019	0.12
2018	0.00
2017	0.10
2016	0.00
2015	0.09
2014	0.55
2013	0.39
2012	0.00
2011	0.00
2010	0.02
2009	0.28
2008	0.00
2007	0.09
2006	0.00
2005	0.00
2004	0.04
2003	0.00
2002	0.01
2001	0.18
2000	0.21
1999	0.59
1998	0.09
1997	0.04
1996	0.04
1995	0.00
1994	0.22
1993	0.00
1992	0.00
1991	0.00
1990	0.12
1989	0.98
1988	0.00
1987	0.00
1986	1.32
1985	0.38
1984	0.10
1983	0.68
1982	0.72
1981	0.03
1980	0.00
1979	0.02
1978	0.19
1977	0.96
1976	0.45
1975	0.00
1974	0.00
1973	0.33
1972	0.54
1971	0.22
1970	0.00
1969	0.01
1968	0.06
1967	0.04
1966	0.10
1965	0.00
1964	0.00
1963	0.06
1962	0.22
1961	0.22
1960	0.00
1959	2.06
1958	0.04
1957	1.46
1956	0.33
1955	0.02
1954	0.00
1953	0.00
1952	0.00
1951	0.08
1950	0.00
1949	0.00
1948	0.09
1947	0.00
1946	0.06
1945	0.04
1944	0.00
1943	0.02
1942	0.18
1941	0.00
1940	0.59
1939	1.06
1938	0.15
1937	0.00
1936	0.00
1935	0.08
1934	0.13
1933	0.14
1932	0.00
1931	0.00
1930	0.10
1929	0.00
1928	0.03
1927	0.00
1926	0.00
1925	0.45
1924	0.00
1923	0.44
1922	0.00
1921	0.35

Notes

Its possible for precipitation totals to include both rain and melted snowfall
Months with more than 10% missing data are excluded