San Luis Obispo September 18 Weather Records

Daily averages and all-time records for weather in San Luis Obispo, California for the date of September 18.
September 18 All-Time Records
1893–2024
Highest temperature 103 °F 2016
Lowest temperature 41 °F 1974
Lowest daily high 64 °F 1999
Highest daily low 62 °F 2015
Most precipitation 0.32 inches 2022
September 18 Average Weather
1991–2020 1
Average high 80.4 °F
Average low 53.5 °F
Chance precipitation 3.5%
San Luis Obispo September 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 79 58 0.00 n/a
2022 75 54 0.32 n/a
2021 73 58 0.00 n/a
2020 83 57 0.00 0.0
2019 82 51 0.00 0.0
2018 71 45 0.00 0.0
2017 83 55 0.00 0.0
2016 103 53 0.00 0.0
2015 95 62 0.00 0.0
2014 79 60 0.00 0.0
2013 88 53 0.00 0.0
2012 73 53 0.00 0.0
2011 82 48 0.00 n/a
2010 72 57 0.00 n/a
2009 88 56 0.00 n/a
2008 74 50 0.00 n/a
2007 71 56 0.00 n/a
2006 86 52 0.00 n/a
2005 76 50 0.00 n/a
2004 76 56 0.00 n/a
2003 84 50 0.00 n/a
2002 80 50 0.00 n/a
2001 73 55 0.00 n/a
2000 87 56 0.00 n/a
1999 64 55 0.00 n/a
1998 79 n/a 0.00 0.0
1997 89 48 n/a n/a
1996 87 55 0.00 0.0
1995 82 50 0.00 0.0
1994 78 53 0.00 0.0
1993 70 45 0.00 0.0
1992 73 49 0.00 0.0
1991 81 50 0.00 0.0
1990 75 52 0.00 0.0
1989 n/a 52 0.00 0.0
1988 n/a n/a n/a n/a
1987 73 52 0.00 0.0
1986 76 53 0.00 0.0
1985 73 48 0.00 0.0
1984 98 62 0.00 0.0
1983 82 57 0.00 0.0
1982 69 59 0.00 0.0
1981 83 53 0.00 0.0
1980 81 54 0.00 0.0
1979 86 51 0.00 0.0
1978 69 57 0.00 0.0
1977 75 50 0.00 0.0
1976 73 53 0.00 0.0
1975 78 54 0.00 0.0
1974 77 41 0.00 0.0
1973 70 50 0.00 0.0
1972 72 46 0.00 0.0
1971 77 50 0.00 0.0
1970 86 49 0.00 0.0
1969 79 49 0.00 0.0
1968 80 46 0.00 0.0
1967 77 59 0.00 0.0
1966 88 51 0.00 0.0
1965 74 54 0.00 0.0
1964 69 44 0.00 0.0
1963 76 57 0.02 0.0
1962 76 52 0.00 0.0
1961 72 52 0.00 0.0
1960 74 51 0.00 0.0
1959 74 49 0.09 0.0
1958 86 52 0.00 0.0
1957 75 50 0.00 0.0
1956 92 58 0.00 0.0
1955 67 54 0.00 0.0
1954 82 52 0.00 0.0
1953 75 57 0.00 0.0
1952 77 49 0.00 0.0
1951 82 57 0.05 0.0
1950 72 48 0.00 0.0
1949 82 54 0.00 0.0
1948 72 50 0.00 0.0
1947 69 44 0.00 0.0
1946 94 58 0.00 0.0
1945 64 53 0.00 0.0
1944 72 53 0.00 0.0
1943 86 51 0.00 0.0
1942 n/a 55 0.00 n/a
1941 70 52 0.00 n/a
1940 78 60 0.00 n/a
1939 93 55 0.00 n/a
1938 81 56 n/a n/a
1937 75 52 0.00 n/a
1936 74 47 0.00 n/a
1935 77 53 0.00 n/a
1934 86 51 0.00 n/a
1933 82 49 0.00 n/a
1932 70 54 0.00 n/a
1931 80 47 0.00 n/a
1930 74 49 0.00 n/a
1929 82 61 0.00 n/a
1928 78 51 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 9/18?
For the date of Sep 18, the highest temperature ever reached in San Luis Obispo history is 103 °F which happened in 2016.
Highest Temperatures in San Luis Obispo on September 18
Rank Temperature Year
1 103 °F 2016
2 98 °F 1984
3 95 °F 2015
4 94 °F 1946
5 93 °F 1939
6 92 °F 1956
7 89 °F 1997
8 88 °F 2009
8 88 °F 1966
8 88 °F 2013
What's the all-time low for San Luis Obispo on 9/18?
For the date of Sep 18, the lowest temperature ever reached in San Luis Obispo history is 41 °F which happened in 1974.
Lowest Temperatures in San Luis Obispo on September 18
Rank Temperature Year
1 41 °F 1974
2 44 °F 1964
2 44 °F 1947
4 45 °F 2018
4 45 °F 1993
6 46 °F 1972
6 46 °F 1968
8 47 °F 1936
8 47 °F 1931
10 48 °F 2011
10 48 °F 1950
10 48 °F 1997
10 48 °F 1985
Lowest High Temperatures in San Luis Obispo on September 18
Rank Temperature Year
1 64 °F 1999
1 64 °F 1945
3 67 °F 1955
4 69 °F 1978
4 69 °F 1947
4 69 °F 1982
4 69 °F 1964
8 70 °F 1973
8 70 °F 1941
8 70 °F 1993
8 70 °F 1932
What's the most it has ever rained in San Luis Obispo on 9/18?
For the date of Sep 18, the most precipitation ever recorded in San Luis Obispo history is 0.32 inches which happened in 2022.
All-Time Most Precipitation in San Luis Obispo on September 18
Rank Precipitation Year
1 0.32 inches 2022
2 0.09 inches 1959
3 0.05 inches 1951
4 0.02 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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