San Luis Obispo May 18 Weather Records

Daily averages and all-time records for weather in San Luis Obispo, California for the date of May 18.
May 18 All-Time Records
1893–2024
Highest temperature 91 °F 1931
Lowest temperature 36 °F 1985
Lowest daily high 53 °F 1994
Highest daily low 59 °F 1983
Most precipitation 0.33 inches 2019
May 18 Average Weather
1991–2020 1
Average high 72.3 °F
Average low 49.0 °F
Chance precipitation 8.2%
San Luis Obispo May 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 75 51 0.00 n/a
2022 78 46 0.00 n/a
2021 73 51 0.00 n/a
2020 70 54 0.05 0.0
2019 67 47 0.33 n/a
2018 68 53 0.00 0.0
2017 80 47 0.00 0.0
2016 79 54 0.00 0.0
2015 68 50 0.00 0.0
2014 73 48 0.00 0.0
2013 73 45 0.00 0.0
2012 70 45 0.00 0.0
2011 61 49 0.10 n/a
2010 68 52 0.03 n/a
2009 77 53 0.00 n/a
2008 89 50 0.00 n/a
2007 71 45 0.01 n/a
2006 72 52 0.00 n/a
2005 74 48 0.00 n/a
2004 72 45 0.00 n/a
2003 82 39 0.00 n/a
2002 69 45 0.00 n/a
2001 68 50 0.00 n/a
2000 74 47 0.00 n/a
1999 77 44 0.00 n/a
1998 72 50 0.00 0.0
1997 84 54 0.00 0.0
1996 74 57 0.00 0.0
1995 67 51 0.00 0.0
1994 53 48 0.06 0.0
1993 73 47 0.00 0.0
1992 73 54 0.00 0.0
1991 66 39 0.00 0.0
1990 65 44 0.00 0.0
1989 68 50 0.00 0.0
1988 67 37 0.00 0.0
1987 65 40 n/a 0.0
1986 85 51 0.00 0.0
1985 66 36 0.00 0.0
1984 77 43 0.00 0.0
1983 80 59 0.00 0.0
1982 67 45 0.00 0.0
1981 77 47 0.00 0.0
1980 72 48 0.00 0.0
1979 68 51 0.00 0.0
1978 85 51 0.00 0.0
1977 61 41 0.00 0.0
1976 69 45 0.00 0.0
1975 72 47 0.00 0.0
1974 60 36 0.00 0.0
1973 76 50 0.00 0.0
1972 65 45 0.00 0.0
1971 75 54 0.00 0.0
1970 85 50 0.00 0.0
1969 74 48 0.00 0.0
1968 76 47 0.00 0.0
1967 83 50 0.00 0.0
1966 76 47 0.00 0.0
1965 68 46 0.00 0.0
1964 68 48 0.00 0.0
1963 70 50 0.00 0.0
1962 64 45 0.00 0.0
1961 66 46 0.00 0.0
1960 68 48 0.00 0.0
1959 69 48 0.00 0.0
1958 71 47 0.00 0.0
1957 71 53 0.11 0.0
1956 75 51 0.00 0.0
1955 70 50 0.00 0.0
1954 74 49 0.00 0.0
1953 70 47 0.00 0.0
1952 82 48 0.00 0.0
1951 73 50 0.00 0.0
1950 63 44 0.00 0.0
1949 58 49 0.02 0.0
1948 59 40 0.00 0.0
1947 72 49 0.00 0.0
1946 62 50 0.00 0.0
1945 65 44 0.00 0.0
1944 59 44 0.12 0.0
1943 68 46 0.00 n/a
1942 68 46 0.00 n/a
1941 70 49 n/a n/a
1940 70 48 0.00 n/a
1939 64 41 0.00 n/a
1938 59 48 n/a n/a
1937 67 48 0.00 n/a
1936 68 55 0.00 n/a
1935 73 45 0.00 n/a
1934 72 48 0.00 n/a
1933 66 43 0.00 n/a
1932 69 46 0.00 n/a
1931 91 57 0.00 n/a
1930 56 43 0.00 n/a
1929 66 39 0.00 n/a
1928 70 54 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 5/18?
For the date of May 18, the highest temperature ever reached in San Luis Obispo history is 91 °F which happened in 1931.
Highest Temperatures in San Luis Obispo on May 18
Rank Temperature Year
1 91 °F 1931
2 89 °F 2008
3 85 °F 1970
3 85 °F 1978
3 85 °F 1986
6 84 °F 1997
7 83 °F 1967
8 82 °F 1952
8 82 °F 2003
10 80 °F 1983
10 80 °F 2017
What's the all-time low for San Luis Obispo on 5/18?
For the date of May 18, the lowest temperature ever reached in San Luis Obispo history is 36 °F which has happened 2 times, most recently in 1985.
Lowest Temperatures in San Luis Obispo on May 18
Rank Temperature Year
1 36 °F 1974
1 36 °F 1985
3 37 °F 1988
4 39 °F 1929
4 39 °F 1991
4 39 °F 2003
7 40 °F 1948
7 40 °F 1987
9 41 °F 1939
9 41 °F 1977
Lowest High Temperatures in San Luis Obispo on May 18
Rank Temperature Year
1 53 °F 1994
2 56 °F 1930
3 58 °F 1949
4 59 °F 1944
4 59 °F 1938
4 59 °F 1948
7 60 °F 1974
8 61 °F 1977
8 61 °F 2011
10 62 °F 1946
What's the most it has ever rained in San Luis Obispo on 5/18?
For the date of May 18, the most precipitation ever recorded in San Luis Obispo history is 0.33 inches which happened in 2019.
All-Time Most Precipitation in San Luis Obispo on May 18
Rank Precipitation Year
1 0.33 inches 2019
2 0.12 inches 1944
3 0.11 inches 1957
4 0.10 inches 2011
5 0.06 inches 1994
6 0.05 inches 2020
7 0.03 inches 2010
8 0.02 inches 1949
9 0.01 inches 2007
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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