San Luis Obispo September 20 Weather Records

Daily averages and all-time records for weather in San Luis Obispo, California for the date of September 20.
September 20 All-Time Records
1893–2024
Highest temperature 100 °F 1939
Lowest temperature 44 °F 1999
Lowest daily high 66 °F 1932
Highest daily low 72 °F 1939
Most precipitation 0.27 inches 1959
September 20 Average Weather
1991–2020 1
Average high 80.2 °F
Average low 53.4 °F
Chance precipitation 4.2%
San Luis Obispo September 20 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 72 63 0.00 n/a
2022 76 57 0.00 n/a
2021 91 61 0.00 n/a
2020 83 51 0.00 0.0
2019 85 52 0.00 0.0
2018 89 50 0.00 0.0
2017 82 58 0.00 0.0
2016 88 60 0.00 0.0
2015 96 62 0.00 0.0
2014 77 60 0.00 0.0
2013 74 53 0.00 0.0
2012 76 53 0.00 0.0
2011 79 51 0.00 n/a
2010 80 53 0.00 n/a
2009 79 56 0.00 n/a
2008 77 57 0.00 n/a
2007 68 47 0.00 n/a
2006 79 51 0.00 n/a
2005 71 51 0.00 n/a
2004 75 46 0.00 n/a
2003 80 51 0.01 n/a
2002 75 49 0.00 n/a
2001 74 56 0.00 n/a
2000 82 57 0.00 n/a
1999 76 44 0.00 n/a
1998 89 50 0.00 0.0
1997 77 n/a n/a n/a
1996 90 49 0.00 0.0
1995 83 53 0.00 0.0
1994 75 53 0.00 0.0
1993 80 48 0.00 0.0
1992 78 49 0.00 0.0
1991 79 51 0.00 0.0
1990 77 50 0.00 0.0
1989 n/a 49 0.00 0.0
1988 74 47 n/a n/a
1987 77 51 0.00 0.0
1986 70 47 0.00 0.0
1985 73 49 0.00 0.0
1984 86 59 0.00 0.0
1983 88 59 0.00 0.0
1982 76 56 0.00 0.0
1981 86 52 0.00 0.0
1980 78 55 0.00 0.0
1979 93 57 0.00 0.0
1978 81 54 0.00 0.0
1977 70 54 0.03 0.0
1976 68 55 0.00 0.0
1975 74 50 0.00 0.0
1974 73 53 0.00 0.0
1973 75 54 0.00 0.0
1972 76 53 0.00 0.0
1971 86 53 0.00 0.0
1970 71 49 0.00 0.0
1969 70 54 0.00 0.0
1968 68 44 0.00 0.0
1967 91 56 0.00 0.0
1966 70 50 0.03 0.0
1965 75 52 0.00 0.0
1964 87 52 0.00 0.0
1963 72 52 0.01 0.0
1962 83 53 0.00 0.0
1961 73 50 0.00 0.0
1960 75 52 0.00 0.0
1959 70 56 0.27 0.0
1958 99 55 0.00 0.0
1957 72 52 0.00 0.0
1956 78 50 0.00 0.0
1955 69 54 0.00 0.0
1954 80 46 0.00 0.0
1953 73 54 0.00 0.0
1952 71 50 0.00 0.0
1951 84 57 0.00 0.0
1950 91 56 0.00 0.0
1949 83 51 0.00 0.0
1948 79 54 0.00 0.0
1947 88 55 0.00 0.0
1946 97 57 0.00 0.0
1945 67 57 0.00 0.0
1944 70 44 0.00 0.0
1943 90 57 0.00 0.0
1942 73 48 0.00 n/a
1941 71 53 0.00 n/a
1940 80 51 0.00 n/a
1939 100 72 0.00 n/a
1938 80 53 n/a n/a
1937 85 53 0.00 n/a
1936 81 50 0.00 n/a
1935 76 54 0.00 n/a
1934 74 54 0.00 n/a
1933 75 47 0.00 n/a
1932 66 48 0.00 n/a
1931 93 55 0.00 n/a
1930 74 52 0.00 n/a
1929 75 57 0.00 n/a
1928 85 47 0.00 n/a
1927 n/a n/a n/a n/a
1926 n/a n/a n/a n/a
1925 n/a n/a n/a n/a
1924 n/a n/a n/a n/a
1923 n/a n/a n/a n/a
1922 n/a n/a n/a n/a
1921 n/a n/a n/a n/a
1920 n/a n/a n/a n/a
1919 n/a n/a n/a n/a
1918 n/a n/a n/a n/a
1917 n/a n/a n/a n/a
1916 n/a n/a n/a n/a
1915 n/a n/a n/a n/a
1914 n/a n/a n/a n/a
1913 n/a n/a n/a n/a
1912 n/a n/a n/a n/a
1911 n/a n/a n/a n/a
1910 n/a n/a n/a n/a
1909 n/a n/a n/a n/a
1908 n/a n/a 0.00 n/a
1907 n/a n/a 0.00 0.0
1906 n/a n/a 0.00 0.0
1905 n/a n/a n/a n/a
1904 n/a n/a n/a n/a
1903 n/a n/a n/a n/a
1902 n/a n/a n/a n/a
1901 n/a n/a n/a n/a
1900 n/a n/a n/a n/a
1899 n/a n/a n/a n/a
1898 n/a n/a n/a n/a
1897 n/a n/a n/a n/a
1896 n/a n/a n/a n/a
1895 n/a n/a 0.00 n/a
1894 n/a n/a 0.00 n/a
1893 n/a n/a 0.00 n/a
What's the all-time high for San Luis Obispo on 9/20?
For the date of Sep 20, the highest temperature ever reached in San Luis Obispo history is 100 °F which happened in 1939.
Highest Temperatures in San Luis Obispo on September 20
Rank Temperature Year
1 100 °F 1939
2 99 °F 1958
3 97 °F 1946
4 96 °F 2015
5 93 °F 1979
5 93 °F 1931
7 91 °F 2021
7 91 °F 1950
7 91 °F 1967
10 90 °F 1996
10 90 °F 1943
What's the all-time low for San Luis Obispo on 9/20?
For the date of Sep 20, the lowest temperature ever reached in San Luis Obispo history is 44 °F which has happened 3 times, most recently in 1999.
Lowest Temperatures in San Luis Obispo on September 20
Rank Temperature Year
1 44 °F 1968
1 44 °F 1999
1 44 °F 1944
4 46 °F 1954
4 46 °F 2004
6 47 °F 1933
6 47 °F 1928
6 47 °F 1988
6 47 °F 1986
6 47 °F 2007
Lowest High Temperatures in San Luis Obispo on September 20
Rank Temperature Year
1 66 °F 1932
2 67 °F 1945
3 68 °F 1968
3 68 °F 2007
3 68 °F 1976
6 69 °F 1955
7 70 °F 1959
7 70 °F 1969
7 70 °F 1977
7 70 °F 1966
7 70 °F 1944
7 70 °F 1986
What's the most it has ever rained in San Luis Obispo on 9/20?
For the date of Sep 20, the most precipitation ever recorded in San Luis Obispo history is 0.27 inches which happened in 1959.
All-Time Most Precipitation in San Luis Obispo on September 20
Rank Precipitation Year
1 0.27 inches 1959
2 0.03 inches 1977
2 0.03 inches 1966
4 0.01 inches 2003
4 0.01 inches 1963
Weather Station Details
Years Station Coordinates
1999–2024 San Luis Obispo Airport location
1893–1998 San Luis Obispo Poly location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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