Riverside September 21 Weather Records

Daily averages and all-time records for weather in Riverside, California for the date of September 21.
September 21 All-Time Records
1893–2024
Highest temperature 109 °F 1943
Lowest temperature 42 °F 1924
Lowest daily high 72 °F 2000
Highest daily low 80 °F 1939
Most precipitation 0.02 inches 1914
September 21 Average Weather
1991–2020 1
Average high 90.4 °F
Average low 60.4 °F
Chance precipitation 2.6%
Riverside September 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 77 61 0.00 n/a
2022 86 61 0.00 n/a
2021 104 62 0.00 n/a
2020 92 62 0.00 0.0
2019 97 58 0.00 0.0
2018 91 61 0.00 0.0
2017 75 58 0.00 0.0
2016 90 68 0.00 0.0
2015 90 71 0.00 0.0
2014 85 64 0.00 0.0
2013 80 63 0.00 0.0
2012 101 65 0.00 0.0
2011 92 59 0.00 0.0
2010 78 57 0.00 n/a
2009 93 62 0.00 n/a
2008 82 58 0.00 n/a
2007 n/a n/a n/a n/a
2006 84 51 0.00 n/a
2005 90 56 0.01 n/a
2004 88 60 0.00 n/a
2003 106 60 0.00 n/a
2002 96 57 0.00 n/a
2001 93 53 0.00 n/a
2000 72 64 0.00 n/a
1999 96 59 0.00 n/a
1998 76 64 0.00 0.0
1997 96 57 0.00 0.0
1996 92 61 0.00 0.0
1995 93 59 0.00 0.0
1994 92 58 0.00 0.0
1993 80 61 0.00 0.0
1992 n/a n/a n/a n/a
1991 96 64 0.00 0.0
1990 84 65 0.00 0.0
1989 100 52 0.00 0.0
1988 74 54 0.00 0.0
1987 94 61 0.00 0.0
1986 81 45 0.00 0.0
1985 95 54 0.00 0.0
1984 88 66 0.00 0.0
1983 89 68 0.00 0.0
1982 96 54 0.00 0.0
1981 93 59 0.00 0.0
1980 82 62 0.00 0.0
1979 95 61 0.00 0.0
1978 92 47 0.00 0.0
1977 88 54 0.00 0.0
1976 80 65 0.00 0.0
1975 102 58 0.00 0.0
1974 103 60 0.00 0.0
1973 83 52 0.00 0.0
1972 99 52 0.00 0.0
1971 79 61 0.00 0.0
1970 83 50 0.00 0.0
1969 78 59 0.00 0.0
1968 79 51 0.00 0.0
1967 85 61 0.00 0.0
1966 97 53 0.00 0.0
1965 91 48 0.00 0.0
1964 84 56 0.00 0.0
1963 87 56 0.00 0.0
1962 95 50 0.00 0.0
1961 72 60 0.00 0.0
1960 87 56 0.00 0.0
1959 81 58 0.00 0.0
1958 95 55 0.00 0.0
1957 98 51 0.00 0.0
1956 93 50 0.00 0.0
1955 84 51 0.00 0.0
1954 97 48 0.00 0.0
1953 84 45 0.00 0.0
1952 95 62 0.00 0.0
1951 95 56 0.00 0.0
1950 87 44 0.00 0.0
1949 96 57 0.00 0.0
1948 73 56 0.00 0.0
1947 85 62 0.00 0.0
1946 95 51 0.00 0.0
1945 77 60 0.00 0.0
1944 83 50 0.00 0.0
1943 109 57 0.00 0.0
1942 104 49 0.00 0.0
1941 83 43 0.00 0.0
1940 89 52 0.00 0.0
1939 105 80 0.00 0.0
1938 103 61 0.00 0.0
1937 88 58 0.00 0.0
1936 95 58 0.00 0.0
1935 89 58 0.00 0.0
1934 91 60 0.00 0.0
1933 91 46 0.00 0.0
1932 84 57 0.00 0.0
1931 91 47 0.00 0.0
1930 85 50 0.00 0.0
1929 73 62 0.00 0.0
1928 105 51 0.00 0.0
1927 94 59 0.00 n/a
1926 95 45 0.00 n/a
1925 94 44 0.00 n/a
1924 94 42 0.00 n/a
1923 90 51 0.00 n/a
1922 101 59 0.00 n/a
1921 97 49 n/a n/a
1920 87 47 0.00 n/a
1919 82 56 n/a n/a
1918 82 53 0.01 n/a
1917 90 57 n/a n/a
1916 88 50 0.00 n/a
1915 98 51 0.00 n/a
1914 85 61 0.02 n/a
1913 98 61 n/a n/a
1912 101 54 0.00 n/a
1911 94 48 0.00 0.0
1910 96 45 0.00 n/a
1909 86 50 0.00 n/a
1908 87 48 0.00 n/a
1907 83 47 0.00 n/a
1906 95 47 0.00 n/a
1905 103 50 0.00 n/a
1904 83 50 0.00 n/a
1903 83 49 0.00 n/a
1902 86 47 0.00 n/a
1901 78 52 0.00 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 50 n/a n/a
1894 103 51 n/a n/a
1893 93 46 n/a n/a
What's the all-time high for Riverside on 9/21?
For the date of Sep 21, the highest temperature ever reached in Riverside history is 109 °F which happened in 1943.
Highest Temperatures in Riverside on September 21
Rank Temperature Year
1 109 °F 1943
2 106 °F 2003
3 105 °F 1928
3 105 °F 1939
5 104 °F 1942
5 104 °F 2021
7 103 °F 1938
7 103 °F 1974
7 103 °F 1905
7 103 °F 1894
What's the all-time low for Riverside on 9/21?
For the date of Sep 21, the lowest temperature ever reached in Riverside history is 42 °F which happened in 1924.
Lowest Temperatures in Riverside on September 21
Rank Temperature Year
1 42 °F 1924
2 43 °F 1941
3 44 °F 1950
3 44 °F 1925
5 45 °F 1910
5 45 °F 1926
5 45 °F 1953
5 45 °F 1986
9 46 °F 1893
9 46 °F 1933
Lowest High Temperatures in Riverside on September 21
Rank Temperature Year
1 72 °F 2000
1 72 °F 1961
3 73 °F 1929
3 73 °F 1948
5 74 °F 1988
6 75 °F 2017
7 76 °F 1998
8 77 °F 1945
8 77 °F 2023
10 78 °F 1969
10 78 °F 2010
10 78 °F 1901
What's the most it has ever rained in Riverside on 9/21?
For the date of Sep 21, the most precipitation ever recorded in Riverside history is 0.02 inches which happened in 1914.
All-Time Most Precipitation in Riverside on September 21
Rank Precipitation Year
1 0.02 inches 1914
2 0.01 inches 1918
2 0.01 inches 2005
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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