San Luis Obispo September Precipitation Totals

A time series of total precipitation in the month of September in San Luis Obispo, California from 1893–2023.

Rainiest September in San Luis Obispo History

The rainiest September in San Luis Obispo, California history happened in 1976, with 3.87 inches of total precipitation.

Driest September in San Luis Obispo History

There have been 49 times where no rain was recorded in San Luis Obispo, California for the entire month of September. The most recent time this happened was 2021.

San Luis Obispo Average September Precipitation by Year

Read important notes
Click column headers to sort

Year	Precipitation (inches)
2023	0.07
2022	1.00
2021	0.00
2020	0.00
2019	0.00
2018	0.00
2017	0.00
2016	0.00
2015	0.02
2014	0.00
2013	0.01
2012	0.00
2011	0.06
2010	0.01
2009	0.02
2008	0.01
2007	0.00
2006	0.01
2005	0.01
2004	0.00
2003	0.01
2002	0.02
2001	0.00
2000	0.05
1999	0.20
1998	0.35
1996	0.00
1995	0.00
1994	2.38
1993	0.00
1992	0.00
1991	0.00
1990	0.56
1989	1.69
1987	0.00
1986	0.78
1985	0.04
1984	0.00
1983	0.15
1982	1.19
1981	0.00
1980	0.00
1979	0.20
1978	1.18
1977	0.03
1976	3.87
1975	0.02
1974	0.00
1973	0.07
1972	0.00
1971	0.19
1970	0.00
1969	0.10
1968	0.01
1967	1.20
1966	1.11
1965	0.00
1964	0.10
1963	0.19
1962	0.00
1961	0.01
1960	0.00
1959	0.73
1958	0.95
1957	0.00
1956	0.00
1955	0.00
1954	0.00
1953	0.00
1952	0.00
1951	0.05
1950	0.03
1949	0.00
1948	0.00
1947	0.00
1946	0.00
1945	0.11
1944	0.00
1943	0.00
1942	0.00
1941	0.00
1940	0.00
1939	0.59
1937	0.00
1936	0.11
1935	0.00
1934	0.07
1933	0.00
1932	0.05
1931	0.00
1930	0.14
1929	0.05
1928	0.00
1908	0.73
1907	0.00
1906	0.00
1895	0.00
1894	1.81
1893	0.03

Notes

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