Riverside May 21 Weather Records

Daily averages and all-time records for weather in Riverside, California for the date of May 21.
May 21 All-Time Records
1893–2024
Highest temperature 104 °F 2000
Lowest temperature 36 °F 1948
Lowest daily high 63 °F 1921
Highest daily low 63 °F 1997
Most precipitation 0.63 inches 1920
May 21 Average Weather
1991–2020 1
Average high 81.3 °F
Average low 55.4 °F
Chance precipitation 4.0%
Riverside May 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 85 60 0.00 n/a
2022 74 57 0.00 n/a
2021 73 52 0.00 n/a
2020 90 54 0.00 0.0
2019 68 51 0.00 0.0
2018 67 57 0.02 0.0
2017 96 62 0.00 0.0
2016 73 54 0.00 0.0
2015 71 58 0.00 0.0
2014 74 53 0.00 0.0
2013 89 59 0.00 0.0
2012 94 60 0.00 0.0
2011 83 54 0.00 n/a
2010 77 56 0.00 n/a
2009 84 56 0.00 n/a
2008 n/a n/a n/a n/a
2007 65 56 0.00 n/a
2006 69 57 0.00 n/a
2005 96 57 0.00 n/a
2004 n/a n/a 0.00 n/a
2003 100 55 0.00 n/a
2002 70 43 0.00 n/a
2001 84 59 0.00 n/a
2000 104 57 0.00 n/a
1999 70 55 0.00 n/a
1998 74 54 0.00 0.0
1997 84 63 0.00 0.0
1996 83 55 0.00 0.0
1995 74 54 0.00 0.0
1994 86 48 0.00 0.0
1993 80 59 0.00 0.0
1992 79 59 0.00 0.0
1991 77 48 0.00 0.0
1990 82 52 0.00 0.0
1989 90 54 0.00 0.0
1988 100 58 0.00 0.0
1987 72 53 0.00 0.0
1986 80 55 0.00 0.0
1985 85 53 0.00 0.0
1984 84 55 0.00 0.0
1983 87 56 0.00 0.0
1982 n/a 58 0.00 0.0
1981 79 46 0.00 0.0
1980 73 55 0.00 0.0
1979 76 58 0.00 0.0
1978 83 56 0.00 0.0
1977 85 51 0.00 0.0
1976 80 51 0.00 0.0
1975 71 46 0.00 0.0
1974 89 47 0.00 0.0
1973 78 57 0.00 0.0
1972 73 43 0.00 0.0
1971 74 53 0.00 0.0
1970 83 50 0.00 0.0
1969 78 57 0.00 0.0
1968 82 57 0.00 0.0
1967 99 56 0.00 0.0
1966 80 57 0.00 0.0
1965 80 54 0.00 0.0
1964 90 51 0.00 0.0
1963 77 56 0.00 0.0
1962 77 43 0.00 0.0
1961 80 49 0.00 0.0
1960 84 52 0.00 0.0
1959 74 50 0.00 0.0
1958 87 55 0.00 0.0
1957 70 52 0.24 0.0
1956 87 51 0.00 0.0
1955 79 55 0.00 0.0
1954 74 57 0.00 0.0
1953 74 50 0.00 0.0
1952 80 53 0.00 0.0
1951 71 51 0.00 0.0
1950 80 44 0.00 0.0
1949 86 42 0.00 0.0
1948 79 36 0.00 0.0
1947 72 57 0.00 0.0
1946 72 54 0.00 0.0
1945 83 41 0.00 0.0
1944 70 55 0.00 0.0
1943 90 47 0.00 0.0
1942 90 54 0.00 0.0
1941 93 50 0.00 0.0
1940 80 58 0.00 0.0
1939 83 43 0.00 0.0
1938 73 44 0.00 0.0
1937 85 51 0.00 0.0
1936 81 48 0.00 0.0
1935 89 46 0.00 0.0
1934 91 49 0.00 0.0
1933 79 45 0.00 0.0
1932 83 51 0.00 0.0
1931 89 46 0.00 0.0
1930 85 48 0.00 0.0
1929 73 49 0.00 0.0
1928 76 57 0.00 0.0
1927 71 46 0.00 n/a
1926 90 52 0.00 n/a
1925 79 55 n/a n/a
1924 82 46 n/a n/a
1923 77 49 0.00 n/a
1922 83 55 n/a n/a
1921 63 54 0.04 n/a
1920 64 56 0.63 n/a
1919 74 49 0.53 n/a
1918 77 51 0.00 n/a
1917 81 49 0.00 n/a
1916 84 43 0.00 n/a
1915 78 43 0.00 n/a
1914 76 55 0.00 n/a
1913 84 51 0.00 n/a
1912 73 52 0.00 n/a
1911 100 43 0.00 n/a
1910 77 53 0.00 0.0
1909 73 54 0.00 n/a
1908 77 47 0.00 n/a
1907 79 48 0.00 n/a
1906 70 50 0.00 n/a
1905 68 55 0.00 n/a
1904 82 53 0.00 n/a
1903 63 50 0.03 n/a
1902 70 37 0.00 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 79 56 0.00 n/a
1894 79 44 n/a n/a
1893 88 43 0.00 n/a
What's the all-time high for Riverside on 5/21?
For the date of May 21, the highest temperature ever reached in Riverside history is 104 °F which happened in 2000.
Highest Temperatures in Riverside on May 21
Rank Temperature Year
1 104 °F 2000
2 100 °F 1911
2 100 °F 1988
2 100 °F 2003
5 99 °F 1967
6 96 °F 2005
6 96 °F 2017
8 94 °F 2012
9 93 °F 1941
10 91 °F 1934
What's the all-time low for Riverside on 5/21?
For the date of May 21, the lowest temperature ever reached in Riverside history is 36 °F which happened in 1948.
Lowest Temperatures in Riverside on May 21
Rank Temperature Year
1 36 °F 1948
2 37 °F 1902
3 41 °F 1945
4 42 °F 1949
5 43 °F 1939
5 43 °F 2002
5 43 °F 1893
5 43 °F 1911
5 43 °F 1915
5 43 °F 1962
5 43 °F 1972
5 43 °F 1916
Lowest High Temperatures in Riverside on May 21
Rank Temperature Year
1 63 °F 1921
1 63 °F 1903
3 64 °F 1920
4 65 °F 2007
5 67 °F 2018
6 68 °F 1905
6 68 °F 2019
8 69 °F 2006
9 70 °F 2002
9 70 °F 1902
9 70 °F 1999
9 70 °F 1906
9 70 °F 1944
9 70 °F 1957
What's the most it has ever rained in Riverside on 5/21?
For the date of May 21, the most precipitation ever recorded in Riverside history is 0.63 inches which happened in 1920.
All-Time Most Precipitation in Riverside on May 21
Rank Precipitation Year
1 0.63 inches 1920
2 0.53 inches 1919
3 0.24 inches 1957
4 0.04 inches 1921
5 0.03 inches 1903
6 0.02 inches 2018
Weather Station Details
Years Station Coordinates
1999–2024 Riverside Municipal Airport location
1893–1998 Riverside Fire Station location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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