San Luis Obispo August 18 Weather Records

Daily averages and all-time records for weather in San Luis Obispo, California for the date of August 18.
August 18 All-Time Records
1893–2024
Highest temperature 100 °F 2020
Lowest temperature 47 °F 1944
Lowest daily high 67 °F 1959
Highest daily low 63 °F 2020
Most precipitation 0.02 inches 1945
August 18 Average Weather
1991–2020 1
Average high 80.2 °F
Average low 54.9 °F
Chance precipitation 1.4%
San Luis Obispo August 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 84 62 0.00 n/a
2022 78 52 0.00 n/a
2021 70 59 0.00 n/a
2020 100 63 0.00 0.0
2019 74 58 0.00 0.0
2018 79 58 0.00 0.0
2017 78 57 0.00 0.0
2016 77 55 0.00 0.0
2015 82 61 0.00 0.0
2014 80 57 0.00 0.0
2013 77 56 0.00 0.0
2012 91 58 0.00 0.0
2011 74 53 0.00 n/a
2010 85 54 0.00 n/a
2009 79 58 0.00 n/a
2008 76 58 0.00 n/a
2007 83 51 0.00 n/a
2006 76 53 0.00 n/a
2005 71 57 0.00 n/a
2004 82 53 0.00 n/a
2003 78 55 0.00 n/a
2002 70 56 0.00 n/a
2001 78 53 0.00 n/a
2000 84 49 0.00 n/a
1999 72 51 0.00 n/a
1998 84 56 0.00 0.0
1997 76 54 0.00 0.0
1996 91 53 0.00 0.0
1995 84 54 0.00 0.0
1994 82 59 0.00 0.0
1993 84 51 0.00 0.0
1992 89 52 0.00 0.0
1991 72 54 0.00 0.0
1990 82 48 0.00 0.0
1989 75 53 0.00 0.0
1988 88 50 0.00 0.0
1987 75 56 0.00 0.0
1986 77 55 0.00 0.0
1985 72 53 0.00 0.0
1984 97 53 0.00 0.0
1983 85 60 0.00 0.0
1982 84 55 0.00 0.0
1981 78 54 0.00 0.0
1980 73 52 0.00 0.0
1979 74 54 0.00 0.0
1978 n/a n/a n/a n/a
1977 83 59 0.00 0.0
1976 72 53 0.00 0.0
1975 73 52 0.00 0.0
1974 76 49 0.00 0.0
1973 82 51 0.00 0.0
1972 73 53 0.00 0.0
1971 80 54 0.00 0.0
1970 79 55 0.00 0.0
1969 79 53 0.00 0.0
1968 73 50 0.00 0.0
1967 87 55 0.00 0.0
1966 84 54 0.00 0.0
1965 75 55 0.00 0.0
1964 82 49 0.00 0.0
1963 78 49 0.00 0.0
1962 92 51 0.00 0.0
1961 80 50 0.00 0.0
1960 77 52 0.00 0.0
1959 67 58 0.00 0.0
1958 81 60 0.00 0.0
1957 80 50 0.00 0.0
1956 75 52 0.00 0.0
1955 71 50 0.00 0.0
1954 73 48 0.00 0.0
1953 78 50 0.00 0.0
1952 85 50 0.00 0.0
1951 76 55 0.00 0.0
1950 86 50 0.00 0.0
1949 81 54 0.00 0.0
1948 79 51 0.00 0.0
1947 74 55 0.00 0.0
1946 75 52 0.00 0.0
1945 80 51 0.02 0.0
1944 75 47 0.00 0.0
1943 72 51 0.00 n/a
1942 77 52 0.00 n/a
1941 80 57 0.00 n/a
1940 76 51 0.00 n/a
1939 79 54 0.00 n/a
1938 72 54 0.00 n/a
1937 75 54 0.00 n/a
1936 78 52 0.00 n/a
1935 76 49 0.00 n/a
1934 84 55 0.00 n/a
1933 75 55 0.00 n/a
1932 86 52 0.00 n/a
1931 73 51 0.00 n/a
1930 80 51 0.00 n/a
1929 85 53 0.00 n/a
1928 79 52 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 n/a 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 8/18?
For the date of Aug 18, the highest temperature ever reached in San Luis Obispo history is 100 °F which happened in 2020.
Highest Temperatures in San Luis Obispo on August 18
Rank Temperature Year
1 100 °F 2020
2 97 °F 1984
3 92 °F 1962
4 91 °F 1996
4 91 °F 2012
6 89 °F 1992
7 88 °F 1988
8 87 °F 1967
9 86 °F 1950
9 86 °F 1932
What's the all-time low for San Luis Obispo on 8/18?
For the date of Aug 18, the lowest temperature ever reached in San Luis Obispo history is 47 °F which happened in 1944.
Lowest Temperatures in San Luis Obispo on August 18
Rank Temperature Year
1 47 °F 1944
2 48 °F 1990
2 48 °F 1954
4 49 °F 1963
4 49 °F 2000
4 49 °F 1964
4 49 °F 1974
4 49 °F 1935
9 50 °F 1961
9 50 °F 1952
9 50 °F 1950
9 50 °F 1988
9 50 °F 1955
9 50 °F 1953
9 50 °F 1968
9 50 °F 1957
Lowest High Temperatures in San Luis Obispo on August 18
Rank Temperature Year
1 67 °F 1959
2 70 °F 2021
2 70 °F 2002
4 71 °F 2005
4 71 °F 1955
6 72 °F 1938
6 72 °F 1943
6 72 °F 1976
6 72 °F 1985
6 72 °F 1991
6 72 °F 1999
What's the most it has ever rained in San Luis Obispo on 8/18?
For the date of Aug 18, the most precipitation ever recorded in San Luis Obispo history is 0.02 inches which happened in 1945.
All-Time Most Precipitation in San Luis Obispo on August 18
Rank Precipitation Year
1 0.02 inches 1945
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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