Riverside August 21 Weather Records

Daily averages and all-time records for weather in Riverside, California for the date of August 21.
August 21 All-Time Records
1893–2024
Highest temperature 108 °F 1982
Lowest temperature 47 °F 1916
Lowest daily high 76 °F 1906
Highest daily low 76 °F 1982
Most precipitation 0.13 inches 2023
August 21 Average Weather
1991–2020 1
Average high 95.7 °F
Average low 64.4 °F
Chance precipitation 0.8%
Riverside August 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 85 63 0.13 n/a
2022 89 65 0.00 n/a
2021 77 64 0.00 n/a
2020 102 73 0.00 0.0
2019 101 62 0.00 0.0
2018 92 67 0.00 0.0
2017 90 63 0.00 0.0
2016 95 66 0.00 0.0
2015 89 66 0.00 0.0
2014 92 64 0.00 0.0
2013 101 65 0.00 0.0
2012 93 69 0.01 0.0
2011 88 59 0.00 n/a
2010 98 66 0.00 n/a
2009 87 63 0.00 n/a
2008 91 63 0.00 n/a
2007 n/a n/a n/a n/a
2006 94 57 0.00 n/a
2005 96 59 0.00 n/a
2004 84 61 0.00 n/a
2003 91 67 0.00 n/a
2002 n/a n/a n/a n/a
2001 86 59 0.00 n/a
2000 91 58 0.00 n/a
1999 100 59 0.00 n/a
1998 101 62 0.00 0.0
1997 100 66 0.00 0.0
1996 100 60 0.00 0.0
1995 98 70 0.00 0.0
1994 93 55 0.00 0.0
1993 91 58 0.00 0.0
1992 101 69 0.00 0.0
1991 100 62 0.00 0.0
1990 90 59 0.00 0.0
1989 83 60 0.00 0.0
1988 88 62 0.00 0.0
1987 93 60 n/a 0.0
1986 102 66 0.00 0.0
1985 95 57 0.00 0.0
1984 93 70 0.00 0.0
1983 84 64 0.00 0.0
1982 108 76 0.03 0.0
1981 103 63 0.00 0.0
1980 92 58 0.00 0.0
1979 89 61 0.00 0.0
1978 91 59 0.00 0.0
1977 93 66 0.00 0.0
1976 92 57 0.00 0.0
1975 82 58 0.00 0.0
1974 88 58 0.00 0.0
1973 95 66 0.00 0.0
1972 101 57 0.00 0.0
1971 89 62 0.00 0.0
1970 91 59 0.00 0.0
1969 107 60 0.00 0.0
1968 81 61 0.00 0.0
1967 95 65 0.00 0.0
1966 91 64 0.00 0.0
1965 88 62 0.00 0.0
1964 92 54 0.00 0.0
1963 92 57 0.00 0.0
1962 94 50 0.00 0.0
1961 103 71 0.00 0.0
1960 91 63 0.00 0.0
1959 92 50 0.00 0.0
1958 88 58 0.00 0.0
1957 94 66 0.00 0.0
1956 97 52 0.00 0.0
1955 96 56 0.00 0.0
1954 84 58 0.00 0.0
1953 94 55 0.00 0.0
1952 95 56 0.00 0.0
1951 90 54 0.00 0.0
1950 89 53 0.00 0.0
1949 101 57 0.00 0.0
1948 87 56 0.00 0.0
1947 82 48 0.00 0.0
1946 98 63 0.00 0.0
1945 96 60 0.00 0.0
1944 101 54 0.00 0.0
1943 89 57 0.00 0.0
1942 93 57 0.00 0.0
1941 91 53 0.00 0.0
1940 102 55 0.00 0.0
1939 94 55 0.00 0.0
1938 97 60 0.00 0.0
1937 92 62 0.00 0.0
1936 90 51 0.00 0.0
1935 99 58 0.00 0.0
1934 92 60 0.00 0.0
1933 88 61 0.00 0.0
1932 100 55 0.00 0.0
1931 99 59 0.00 0.0
1930 103 57 0.00 0.0
1929 97 61 0.00 0.0
1928 97 58 0.00 0.0
1927 96 59 0.00 n/a
1926 86 64 n/a n/a
1925 98 49 n/a n/a
1924 82 61 n/a n/a
1923 93 58 n/a n/a
1922 96 55 n/a n/a
1921 100 59 n/a 0.0
1920 92 52 n/a 0.0
1919 99 58 n/a n/a
1918 89 48 n/a n/a
1917 94 48 n/a n/a
1916 89 47 n/a n/a
1915 97 51 n/a n/a
1914 90 51 0.00 n/a
1913 100 62 0.00 n/a
1912 92 52 0.00 0.0
1911 96 54 0.00 n/a
1910 101 66 0.00 n/a
1909 93 61 n/a n/a
1908 101 57 0.00 n/a
1907 99 61 n/a n/a
1906 76 58 n/a n/a
1905 88 57 0.00 n/a
1904 90 62 0.00 n/a
1903 99 65 0.00 n/a
1902 87 52 0.00 n/a
1901 89 51 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 96 57 n/a n/a
1894 96 59 n/a n/a
1893 n/a n/a n/a n/a
What's the all-time high for Riverside on 8/21?
For the date of Aug 21, the highest temperature ever reached in Riverside history is 108 °F which happened in 1982.
Highest Temperatures in Riverside on August 21
Rank Temperature Year
1 108 °F 1982
2 107 °F 1969
3 103 °F 1930
3 103 °F 1961
3 103 °F 1981
6 102 °F 2020
6 102 °F 1940
6 102 °F 1986
9 101 °F 2013
9 101 °F 1949
9 101 °F 1944
9 101 °F 1972
9 101 °F 2019
9 101 °F 1910
9 101 °F 1998
9 101 °F 1908
9 101 °F 1992
What's the all-time low for Riverside on 8/21?
For the date of Aug 21, the lowest temperature ever reached in Riverside history is 47 °F which happened in 1916.
Lowest Temperatures in Riverside on August 21
Rank Temperature Year
1 47 °F 1916
2 48 °F 1917
2 48 °F 1947
2 48 °F 1918
5 49 °F 1925
6 50 °F 1962
6 50 °F 1959
8 51 °F 1901
8 51 °F 1936
8 51 °F 1914
8 51 °F 1915
Lowest High Temperatures in Riverside on August 21
Rank Temperature Year
1 76 °F 1906
2 77 °F 2021
3 81 °F 1968
4 82 °F 1924
4 82 °F 1975
4 82 °F 1947
7 83 °F 1989
8 84 °F 1983
8 84 °F 2004
8 84 °F 1954
What's the most it has ever rained in Riverside on 8/21?
For the date of Aug 21, the most precipitation ever recorded in Riverside history is 0.13 inches which happened in 2023.
All-Time Most Precipitation in Riverside on August 21
Rank Precipitation Year
1 0.13 inches 2023
2 0.03 inches 1982
3 0.01 inches 2012
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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