Riverside September 18 Weather Records

Daily averages and all-time records for weather in Riverside, California for the date of September 18.
September 18 All-Time Records
1893–2024
Highest temperature 108 °F 1917
Lowest temperature 42 °F 1933
Lowest daily high 69 °F 1965
Highest daily low 69 °F 1984
Most precipitation 1.37 inches 1963
September 18 Average Weather
1991–2020 1
Average high 91.6 °F
Average low 61.2 °F
Chance precipitation 1.8%
Riverside September 18 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 81 62 0.00 n/a
2022 83 62 0.00 n/a
2021 84 59 0.00 n/a
2020 102 67 0.00 0.0
2019 89 61 0.00 0.0
2018 92 57 0.00 0.0
2017 84 59 0.00 0.0
2016 106 61 0.00 0.0
2015 95 61 0.00 0.0
2014 86 68 0.00 0.0
2013 84 59 0.00 0.0
2012 94 62 0.00 0.0
2011 96 57 0.00 0.0
2010 91 55 0.00 n/a
2009 100 66 0.00 n/a
2008 96 67 0.00 n/a
2007 n/a n/a n/a n/a
2006 95 51 0.00 n/a
2005 86 52 0.00 n/a
2004 84 58 0.00 n/a
2003 94 55 0.00 n/a
2002 85 61 0.00 n/a
2001 85 54 0.00 n/a
2000 99 63 0.00 n/a
1999 71 57 0.00 n/a
1998 92 57 0.00 0.0
1997 94 62 0.00 0.0
1996 87 61 0.00 0.0
1995 91 58 0.00 0.0
1994 91 62 0.00 0.0
1993 80 52 0.00 0.0
1992 n/a n/a n/a n/a
1991 92 59 0.00 0.0
1990 82 64 0.00 0.0
1989 76 58 0.00 0.0
1988 80 58 0.00 0.0
1987 90 57 0.00 0.0
1986 85 52 0.00 0.0
1985 n/a 58 0.09 0.0
1984 105 69 0.00 0.0
1983 97 63 0.00 0.0
1982 88 60 0.00 0.0
1981 95 65 0.41 0.0
1980 97 62 0.00 0.0
1979 103 61 0.00 0.0
1978 78 55 0.00 0.0
1977 85 52 0.00 0.0
1976 80 54 0.00 0.0
1975 92 63 0.00 0.0
1974 90 56 0.00 0.0
1973 82 52 0.00 0.0
1972 81 55 0.00 0.0
1971 92 61 0.00 0.0
1970 94 52 0.00 0.0
1969 86 56 0.00 0.0
1968 88 55 0.00 0.0
1967 82 60 0.00 0.0
1966 92 63 0.00 0.0
1965 69 58 0.73 0.0
1964 75 57 0.00 0.0
1963 73 64 1.37 0.0
1962 95 58 0.00 0.0
1961 79 54 0.00 0.0
1960 91 54 0.00 0.0
1959 80 57 0.00 0.0
1958 99 52 0.00 0.0
1957 82 52 0.00 0.0
1956 97 59 0.00 0.0
1955 79 56 0.00 0.0
1954 96 49 0.00 0.0
1953 82 51 0.00 0.0
1952 100 56 0.00 0.0
1951 101 58 0.00 0.0
1950 80 53 0.00 0.0
1949 95 55 0.00 0.0
1948 85 62 0.00 0.0
1947 83 57 0.02 0.0
1946 97 57 0.00 0.0
1945 70 60 0.00 0.0
1944 76 58 0.00 0.0
1943 103 52 0.00 0.0
1942 82 60 0.00 0.0
1941 79 58 0.00 0.0
1940 88 55 0.00 0.0
1939 107 65 0.00 0.0
1938 93 65 0.00 0.0
1937 101 60 0.00 0.0
1936 93 52 0.00 0.0
1935 92 55 0.00 0.0
1934 95 60 0.00 0.0
1933 81 42 0.00 0.0
1932 85 52 0.00 0.0
1931 85 47 0.00 0.0
1930 89 50 0.00 0.0
1929 84 65 0.11 0.0
1928 101 53 0.00 0.0
1927 86 51 0.00 n/a
1926 89 47 0.00 n/a
1925 90 64 0.00 n/a
1924 81 50 0.00 n/a
1923 86 53 0.00 n/a
1922 107 59 0.00 n/a
1921 81 54 n/a n/a
1920 96 55 0.00 n/a
1919 82 47 n/a n/a
1918 85 58 0.00 n/a
1917 108 54 n/a n/a
1916 94 48 0.00 n/a
1915 89 48 0.00 n/a
1914 94 64 0.00 n/a
1913 103 62 n/a n/a
1912 106 54 0.00 n/a
1911 94 48 0.00 0.0
1910 100 53 0.00 n/a
1909 93 57 0.00 n/a
1908 81 46 0.00 n/a
1907 82 44 0.00 n/a
1906 95 45 0.00 n/a
1905 85 44 0.00 n/a
1904 79 n/a 0.00 n/a
1903 84 47 0.00 n/a
1902 83 56 0.00 n/a
1901 87 49 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 83 45 n/a n/a
1894 98 53 n/a n/a
1893 79 53 n/a n/a
What's the all-time high for Riverside on 9/18?
For the date of Sep 18, the highest temperature ever reached in Riverside history is 108 °F which happened in 1917.
Highest Temperatures in Riverside on September 18
Rank Temperature Year
1 108 °F 1917
2 107 °F 1922
2 107 °F 1939
4 106 °F 1912
4 106 °F 2016
6 105 °F 1984
7 103 °F 1979
7 103 °F 1913
7 103 °F 1943
10 102 °F 2020
What's the all-time low for Riverside on 9/18?
For the date of Sep 18, the lowest temperature ever reached in Riverside history is 42 °F which happened in 1933.
Lowest Temperatures in Riverside on September 18
Rank Temperature Year
1 42 °F 1933
2 44 °F 1907
2 44 °F 1905
4 45 °F 1906
4 45 °F 1895
6 46 °F 1908
7 47 °F 1903
7 47 °F 1931
7 47 °F 1926
7 47 °F 1919
Lowest High Temperatures in Riverside on September 18
Rank Temperature Year
1 69 °F 1965
2 70 °F 1945
3 71 °F 1999
4 73 °F 1963
5 75 °F 1964
6 76 °F 1989
6 76 °F 1944
8 78 °F 1978
9 79 °F 1904
9 79 °F 1893
9 79 °F 1955
9 79 °F 1961
9 79 °F 1941
What's the most it has ever rained in Riverside on 9/18?
For the date of Sep 18, the most precipitation ever recorded in Riverside history is 1.37 inches which happened in 1963.
All-Time Most Precipitation in Riverside on September 18
Rank Precipitation Year
1 1.37 inches 1963
2 0.73 inches 1965
3 0.41 inches 1981
4 0.11 inches 1929
5 0.09 inches 1985
6 0.02 inches 1947
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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