San Luis Obispo April 21 Weather Records

Daily averages and all-time records for weather in San Luis Obispo, California for the date of April 21.
April 21 All-Time Records
1893–2024
Highest temperature 97 °F 2009
Lowest temperature 34 °F 1970
Lowest daily high 54 °F 1963
Highest daily low 66 °F 1958
Most precipitation 0.74 inches 1967
April 21 Average Weather
1991–2020 1
Average high 70.8 °F
Average low 46.8 °F
Chance precipitation 15.7%
San Luis Obispo April 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2024 77 55 0.00 n/a
2023 85 54 0.00 n/a
2022 64 52 0.25 n/a
2021 57 50 0.00 n/a
2020 69 48 0.00 0.0
2019 64 44 0.00 0.0
2018 80 46 0.00 0.0
2017 85 54 0.00 0.0
2016 76 46 0.00 0.0
2015 62 53 0.00 0.0
2014 76 49 0.00 0.0
2013 83 45 0.00 0.0
2012 74 49 0.00 0.0
2011 66 46 0.06 n/a
2010 57 42 0.01 n/a
2009 97 57 0.00 n/a
2008 65 44 0.00 n/a
2007 67 38 0.00 n/a
2006 63 52 0.00 n/a
2005 72 38 0.00 n/a
2004 66 47 0.00 n/a
2003 62 41 0.00 n/a
2002 68 40 0.00 n/a
2001 58 42 0.08 n/a
2000 62 53 0.00 n/a
1999 61 47 0.00 n/a
1998 82 54 0.00 0.0
1997 84 58 0.00 0.0
1996 68 48 0.00 0.0
1995 59 41 0.08 0.0
1994 72 45 0.00 0.0
1993 75 48 0.00 0.0
1992 79 49 0.00 0.0
1991 64 47 0.17 0.0
1990 67 48 0.00 0.0
1989 72 47 0.00 0.0
1988 n/a n/a n/a n/a
1987 81 55 n/a 0.0
1986 92 59 0.00 0.0
1985 58 45 0.07 0.0
1984 n/a n/a 0.00 0.0
1983 63 43 0.42 0.0
1982 81 50 0.00 0.0
1981 66 48 0.00 0.0
1980 70 46 0.00 0.0
1979 75 55 0.00 0.0
1978 63 43 0.00 0.0
1977 78 38 0.00 0.0
1976 77 40 0.00 0.0
1975 75 45 0.00 0.0
1974 66 46 0.00 0.0
1973 67 47 0.00 0.0
1972 67 41 0.00 0.0
1971 60 41 0.02 0.0
1970 64 34 0.00 0.0
1969 80 48 0.00 0.0
1968 63 36 0.00 0.0
1967 58 42 0.74 0.0
1966 69 40 0.00 0.0
1965 70 51 0.00 0.0
1964 62 43 0.00 0.0
1963 54 34 0.37 0.0
1962 64 49 0.00 0.0
1961 64 39 0.00 0.0
1960 82 50 0.00 0.0
1959 71 49 0.00 0.0
1958 89 66 0.00 0.0
1957 54 42 0.55 0.0
1956 80 49 0.00 0.0
1955 63 47 0.07 0.0
1954 60 48 0.00 0.0
1953 62 48 0.00 0.0
1952 73 43 0.00 0.0
1951 63 50 0.00 0.0
1950 74 47 0.00 0.0
1949 76 54 0.00 0.0
1948 58 49 0.00 0.0
1947 62 49 0.00 0.0
1946 75 47 0.00 0.0
1945 64 47 0.00 0.0
1944 59 39 0.00 0.0
1943 74 49 0.00 n/a
1942 82 53 0.17 n/a
1941 68 44 0.00 n/a
1940 58 47 n/a n/a
1939 63 48 0.00 n/a
1938 68 46 n/a n/a
1937 67 48 0.00 n/a
1936 66 48 0.00 n/a
1935 71 47 0.00 n/a
1934 72 49 0.00 n/a
1933 70 42 0.00 n/a
1932 63 35 0.00 n/a
1931 69 46 0.00 n/a
1930 75 52 0.00 n/a
1929 66 42 0.00 n/a
1928 70 46 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 0.14 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 0.00 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 4/21?
For the date of Apr 21, the highest temperature ever reached in San Luis Obispo history is 97 °F which happened in 2009.
Highest Temperatures in San Luis Obispo on April 21
Rank Temperature Year
1 97 °F 2009
2 92 °F 1986
3 89 °F 1958
4 85 °F 2017
4 85 °F 2023
6 84 °F 1997
7 83 °F 2013
8 82 °F 1998
8 82 °F 1942
8 82 °F 1960
What's the all-time low for San Luis Obispo on 4/21?
For the date of Apr 21, the lowest temperature ever reached in San Luis Obispo history is 34 °F which has happened 2 times, most recently in 1970.
Lowest Temperatures in San Luis Obispo on April 21
Rank Temperature Year
1 34 °F 1963
1 34 °F 1970
3 35 °F 1932
4 36 °F 1968
5 38 °F 1977
5 38 °F 2007
5 38 °F 2005
8 39 °F 1944
8 39 °F 1961
10 40 °F 1966
10 40 °F 2002
10 40 °F 1976
Lowest High Temperatures in San Luis Obispo on April 21
Rank Temperature Year
1 54 °F 1963
1 54 °F 1957
3 57 °F 2010
3 57 °F 2021
5 58 °F 1967
5 58 °F 1940
5 58 °F 2001
5 58 °F 1948
5 58 °F 1985
10 59 °F 1944
10 59 °F 1995
What's the most it has ever rained in San Luis Obispo on 4/21?
For the date of Apr 21, the most precipitation ever recorded in San Luis Obispo history is 0.74 inches which happened in 1967.
All-Time Most Precipitation in San Luis Obispo on April 21
Rank Precipitation Year
1 0.74 inches 1967
2 0.55 inches 1957
3 0.42 inches 1983
4 0.37 inches 1963
5 0.25 inches 2022
6 0.17 inches 1991
6 0.17 inches 1942
8 0.14 inches 1915
9 0.08 inches 1995
9 0.08 inches 2001
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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