Average September Temperature in San Luis Obispo by Year

This page contains a list of the average monthly high and low temperatures in San Luis Obispo, California for the month of September each year between 1928 and 2023. It is based on NOAA data.

Change:

Month:

What Was the Hottest September Ever in San Luis Obispo?

1984 was the warmest September in the history of San Luis Obispo, California. The average daily high temperature was 88.7 °F, and the average low was 59.7 °F.

What Was the Coldest September Ever in San Luis Obispo?

1930 was the coolest September in the history of San Luis Obispo, California. The average daily high temperature was 74.4 °F, and the average low was 48.7 °F.

* click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	15	79.4	57.8
2022	4	84.0	58.7
2021	20	79.7	55.9
2020	14	82.9	54.4
2019	16	83.1	53.7
2018	82	76.5	51.6
2017	5	84.0	57.7
2016	11	83.6	55.0
2015	2	87.7	59.0
2014	23	79.2	55.8
2013	21	80.9	54.3
2012	45	77.7	53.5
2011	33	77.8	55.0
2010	29	80.9	52.7
2009	8	84.4	56.1
2008	19	80.8	55.0
2007	53	78.4	52.5
2006	69	76.1	53.7
2005	87	75.4	51.1
2004	24	82.2	52.6
2003	48	78.4	52.8
2002	60	79.5	50.8
2001	42	78.0	53.5
2000	13	81.1	56.2
1999	85	75.7	51.9
1998	18	81.3	54.5
1997	3	87.0	56.1
1996	31	81.0	52.2
1995	27	80.8	53.2
1994	43	79.2	52.2
1993	40	80.5	51.2
1992	50	81.2	49.9
1991	46	79.6	51.5
1990	32	80.7	52.3
1988	79	78.5	50.1
1987	57	78.5	52.1
1986	92	74.4	49.8
1985	74	76.8	52.2
1984	1	88.7	59.7
1983	6	82.9	58.5
1982	30	80.0	53.5
1981	41	79.0	52.6
1980	80	76.8	51.7
1979	7	86.7	54.3
1978	10	82.9	56.7
1977	77	76.7	52.0
1976	34	77.2	55.4
1975	78	76.7	52.0
1974	88	76.8	49.6
1973	72	76.7	52.6
1972	67	77.1	52.7
1971	25	82.4	52.3
1970	66	80.6	49.2
1969	81	76.9	51.4
1968	71	78.2	51.3
1967	17	80.3	56.1
1966	68	77.6	52.1
1965	91	73.6	51.6
1964	90	76.0	49.7
1963	22	82.3	52.9
1962	89	75.3	50.5
1961	64	78.5	51.5
1960	55	78.9	51.8
1959	51	77.7	53.4
1958	9	83.8	56.1
1957	49	78.3	52.8
1956	26	82.0	52.2
1955	56	77.9	52.7
1954	73	80.0	49.2
1953	62	76.6	53.5
1952	65	79.1	50.8
1951	59	76.9	53.4
1950	38	77.6	54.4
1949	36	79.6	52.8
1948	61	79.8	50.3
1947	63	78.5	51.5
1946	39	80.2	51.8
1945	35	78.9	53.6
1944	76	77.0	51.7
1943	37	79.0	53.2
1941	75	76.1	52.7
1940	52	77.0	53.9
1939	12	81.6	56.5
1938	54	78.0	52.7
1937	58	78.0	52.4
1936	70	78.0	51.7
1935	83	74.8	53.1
1934	44	80.1	51.1
1933	93	73.6	50.1
1932	86	74.6	52.5
1931	28	81.9	52.0
1930	94	74.4	48.7
1929	84	76.2	51.7
1928	47	80.5	50.6

Weather Station Details

Years	Station	Coordinates
1999–2024	San Luis Obispo Airport	location
1893–1998	San Luis Obispo Poly	location