Waterloo September 20 Weather Records

Daily averages and all-time records for weather in Waterloo, Iowa for the date of September 20.
September 20 All-Time Records
1895–2024
Highest temperature 96 °F 2022
Lowest temperature 27 °F 1991
Lowest daily high 52 °F 1983
Highest daily low 71 °F 2022
Most precipitation 1.67 inches 1965
Most snow none -
September 20 Average Weather
1991–2020 1
Average high 73.8 °F
Average low 49.4 °F
Chance precipitation 29.8%
Chance snow 0%
Waterloo September 20 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 80 58 0.06 0.0
2022 96 71 0.00 0.0
2021 84 59 0.28 0.0
2020 73 50 0.00 0.0
2019 88 67 0.06 0.0
2018 90 65 0.87 0.0
2017 85 65 0.11 0.0
2016 86 48 0.00 0.0
2015 74 42 0.00 0.0
2014 82 55 0.24 0.0
2013 66 49 0.00 0.0
2012 69 39 0.00 0.0
2011 79 48 0.01 0.0
2010 88 53 0.00 0.0
2009 76 52 0.00 0.0
2008 81 51 0.00 0.0
2007 82 50 0.00 0.0
2006 62 33 0.00 0.0
2005 87 48 0.00 0.0
2004 82 60 0.00 0.0
2003 73 37 0.00 0.0
2002 75 57 0.23 0.0
2001 76 50 0.55 0.0
2000 63 45 0.02 0.0
1999 59 36 0.00 0.0
1998 80 57 0.05 0.0
1997 66 40 0.00 0.0
1996 74 56 0.02 0.0
1995 57 41 0.11 0.0
1994 84 55 0.00 0.0
1993 72 57 0.14 0.0
1992 64 52 0.17 0.0
1991 60 27 0.00 0.0
1990 67 47 0.15 0.0
1989 80 53 0.00 0.0
1988 69 43 0.00 0.0
1987 61 50 0.04 0.0
1986 76 55 0.16 0.0
1985 76 51 0.09 0.0
1984 82 55 0.00 0.0
1983 52 40 0.60 0.0
1982 56 37 0.00 0.0
1981 76 39 0.00 0.0
1980 86 62 1.25 0.0
1979 82 53 0.00 0.0
1978 60 53 0.87 0.0
1977 65 48 0.00 0.0
1976 66 50 0.00 0.0
1975 57 45 0.00 0.0
1974 71 41 0.00 0.0
1973 62 46 0.00 0.0
1972 81 57 0.38 0.0
1971 68 31 0.00 0.0
1970 88 61 0.00 0.0
1969 73 47 0.00 0.0
1968 67 47 0.00 0.0
1967 72 58 0.10 0.0
1966 79 50 0.00 0.0
1965 67 58 1.67 0.0
1964 76 57 0.60 0.0
1963 66 51 0.13 0.0
1962 61 32 0.00 0.0
1961 74 55 0.01 0.0
1960 72 51 0.00 0.0
1959 86 65 0.00 0.0
1958 71 55 0.00 0.0
1957 60 50 0.13 0.0
1956 60 33 0.00 0.0
1955 80 49 0.05 0.0
1954 80 51 0.00 0.0
1953 77 53 0.00 0.0
1952 68 37 0.00 0.0
1951 79 60 0.00 0.0
1950 74 54 0.00 0.0
1949 78 36 0.00 0.0
1948 80 66 0.50 0.0
1947 84 63 n/a 0.0
1946 73 47 n/a 0.0
1945 70 40 n/a 0.0
1944 76 62 0.46 0.0
1943 64 34 0.57 0.0
1942 66 35 0.00 0.0
1941 87 64 0.00 0.0
1940 87 61 0.00 0.0
1939 74 56 0.00 0.0
1938 67 41 0.00 0.0
1937 74 37 0.00 0.0
1936 81 60 0.00 0.0
1935 77 66 0.05 0.0
1934 69 46 n/a 0.0
1933 74 51 0.00 0.0
1932 79 46 n/a 0.0
1931 90 70 0.58 0.0
1930 72 38 0.00 0.0
1929 60 41 0.00 0.0
1928 75 50 n/a 0.0
1927 56 37 n/a 0.0
1926 67 51 0.00 0.0
1925 84 57 n/a 0.0
1924 73 53 n/a 0.0
1923 62 55 n/a 0.0
1922 71 54 0.00 0.0
1921 84 62 0.11 0.0
1920 86 61 0.00 0.0
1919 88 61 n/a 0.0
1918 53 33 0.00 0.0
1917 75 59 0.05 0.0
1916 68 40 0.00 0.0
1915 82 54 n/a 0.0
1914 87 60 0.00 0.0
1913 72 46 n/a 0.0
1912 72 45 0.00 0.0
1911 69 44 n/a 0.0
1910 75 53 0.00 0.0
1909 83 59 0.00 0.0
1908 92 59 0.00 0.0
1907 86 69 0.00 0.0
1906 85 57 0.10 0.0
1905 72 45 0.00 0.0
1904 75 54 n/a 0.0
1903 81 52 0.00 0.0
1902 67 51 n/a 0.0
1901 62 37 0.00 0.0
1900 64 46 0.00 0.0
1899 71 39 0.00 0.0
1898 83 52 0.00 0.0
1897 65 32 0.00 0.0
1896 57 30 0.00 0.0
1895 91 67 n/a 0.0
What's the all-time high for Waterloo on 9/20?
For the date of Sep 20, the highest temperature ever reached in Waterloo history is 96 °F which happened in 2022.
Highest Temperatures in Waterloo on September 20
Rank Temperature Year
1 96 °F 2022
2 92 °F 1908
3 91 °F 1895
4 90 °F 1931
4 90 °F 2018
6 88 °F 1919
6 88 °F 1970
6 88 °F 2010
6 88 °F 2019
10 87 °F 1940
10 87 °F 1941
10 87 °F 2005
10 87 °F 1914
What's the all-time low for Waterloo on 9/20?
For the date of Sep 20, the lowest temperature ever reached in Waterloo history is 27 °F which happened in 1991.
Lowest Temperatures in Waterloo on September 20
Rank Temperature Year
1 27 °F 1991
2 30 °F 1896
3 31 °F 1971
4 32 °F 1897
4 32 °F 1962
6 33 °F 1918
6 33 °F 1956
6 33 °F 2006
9 34 °F 1943
10 35 °F 1942
Lowest High Temperatures in Waterloo on September 20
Rank Temperature Year
1 52 °F 1983
2 53 °F 1918
3 56 °F 1982
3 56 °F 1927
5 57 °F 1975
5 57 °F 1995
5 57 °F 1896
8 59 °F 1999
9 60 °F 1991
9 60 °F 1929
9 60 °F 1978
9 60 °F 1957
9 60 °F 1956
What's the most it has ever rained in Waterloo on 9/20?
For the date of Sep 20, the most precipitation ever recorded in Waterloo history is 1.67 inches which happened in 1965.
All-Time Most Precipitation in Waterloo on September 20
Rank Precipitation Year
1 1.67 inches 1965
2 1.25 inches 1980
3 0.87 inches 2018
3 0.87 inches 1978
5 0.60 inches 1983
5 0.60 inches 1964
7 0.58 inches 1931
8 0.57 inches 1943
9 0.55 inches 2001
10 0.50 inches 1948
Weather Station Details
Years Station Coordinates
1950–2024 Waterloo Municipal Airport location
1895–1950 Waterloo location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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