Waterloo September 21 Weather Records

Daily averages and all-time records for weather in Waterloo, Iowa for the date of September 21.
September 21 All-Time Records
1895–2024
Highest temperature 94 °F 1908
Lowest temperature 27 °F 1918
Lowest daily high 51 °F 1983
Highest daily low 73 °F 2019
Most precipitation 3.08 inches 1950
Most snow none -
September 21 Average Weather
1991–2020 1
Average high 73.4 °F
Average low 48.9 °F
Chance precipitation 30.2%
Chance snow 0%
Waterloo September 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 84 51 0.00 0.0
2022 77 51 0.00 0.0
2021 73 50 0.00 0.0
2020 79 48 0.00 0.0
2019 77 73 0.00 0.0
2018 67 44 0.02 0.0
2017 91 61 0.00 0.0
2016 84 69 0.00 0.0
2015 77 50 0.00 0.0
2014 67 47 0.00 0.0
2013 68 42 0.00 0.0
2012 65 43 0.03 0.0
2011 63 50 0.00 0.0
2010 76 63 0.35 0.0
2009 71 51 0.74 0.0
2008 80 52 0.00 0.0
2007 88 55 0.38 0.0
2006 66 48 0.19 0.0
2005 92 60 0.00 0.0
2004 86 57 0.00 0.0
2003 57 43 0.34 0.0
2002 69 48 0.00 0.0
2001 72 49 0.00 0.0
2000 65 36 0.00 0.0
1999 64 32 0.00 0.0
1998 67 47 0.00 0.0
1997 65 36 0.00 0.0
1996 66 53 0.00 0.0
1995 52 34 0.04 0.0
1994 84 58 0.51 0.0
1993 73 55 0.04 0.0
1992 68 51 0.00 0.0
1991 67 34 0.00 0.0
1990 70 45 0.01 0.0
1989 79 49 0.00 0.0
1988 69 40 0.25 0.0
1987 66 47 0.00 0.0
1986 86 66 0.00 0.0
1985 57 49 0.17 0.0
1984 87 55 0.00 0.0
1983 51 34 0.00 0.0
1982 62 32 0.00 0.0
1981 70 52 0.00 0.0
1980 77 59 0.35 0.0
1979 70 42 0.00 0.0
1978 65 45 0.00 0.0
1977 70 50 0.12 0.0
1976 64 40 0.00 0.0
1975 54 42 0.00 0.0
1974 60 31 0.00 0.0
1973 68 46 1.59 0.0
1972 62 40 0.00 0.0
1971 71 48 0.00 0.0
1970 81 59 0.09 0.0
1969 76 45 0.00 0.0
1968 80 53 0.00 0.0
1967 68 46 0.00 0.0
1966 80 42 0.00 0.0
1965 67 49 0.58 0.0
1964 66 52 0.00 0.0
1963 73 49 0.00 0.0
1962 67 40 0.08 0.0
1961 77 60 0.00 0.0
1960 71 56 1.91 0.0
1959 83 64 0.20 0.0
1958 74 51 0.00 0.0
1957 66 49 0.09 0.0
1956 82 46 0.00 0.0
1955 78 54 0.61 0.0
1954 67 47 0.00 0.0
1953 64 39 0.00 0.0
1952 71 35 0.00 0.0
1951 68 55 0.00 0.0
1950 60 60 3.08 0.0
1949 72 52 0.00 0.0
1948 70 56 0.22 0.0
1947 75 58 n/a 0.0
1946 76 53 0.00 0.0
1945 74 43 0.00 0.0
1944 74 58 0.00 0.0
1943 73 40 0.00 0.0
1942 73 35 n/a 0.0
1941 87 64 0.00 0.0
1940 87 61 n/a 0.0
1939 81 38 0.00 0.0
1938 71 39 0.00 0.0
1937 93 51 0.00 0.0
1936 83 48 0.00 0.0
1935 78 52 0.01 0.0
1934 51 43 n/a 0.0
1933 80 41 0.00 0.0
1932 71 42 0.00 0.0
1931 76 67 0.50 0.0
1930 81 48 0.00 0.0
1929 70 53 0.00 0.0
1928 71 44 n/a 0.0
1927 58 45 0.00 0.0
1926 87 62 0.00 0.0
1925 67 41 n/a 0.0
1924 82 50 n/a 0.0
1923 75 41 0.23 0.0
1922 75 47 0.00 0.0
1921 77 53 0.40 0.0
1920 89 64 0.00 0.0
1919 80 55 n/a 0.0
1918 65 27 0.00 0.0
1917 62 47 0.17 0.0
1916 87 44 0.00 0.0
1915 57 39 0.00 0.0
1914 84 68 n/a 0.0
1913 51 37 0.00 0.0
1912 60 40 0.21 0.0
1911 63 46 n/a 0.0
1910 81 50 0.00 0.0
1909 87 59 0.00 0.0
1908 94 59 0.00 0.0
1907 71 46 n/a 0.0
1906 81 56 0.00 0.0
1905 83 55 0.00 0.0
1904 67 39 0.01 0.0
1903 79 56 0.00 0.0
1902 66 58 n/a 0.0
1901 70 40 0.00 0.0
1900 75 43 n/a 0.0
1899 83 41 n/a 0.0
1898 85 55 n/a 0.0
1897 77 38 0.00 0.0
1896 70 39 0.00 0.0
1895 90 66 n/a 0.0
What's the all-time high for Waterloo on 9/21?
For the date of Sep 21, the highest temperature ever reached in Waterloo history is 94 °F which happened in 1908.
Highest Temperatures in Waterloo on September 21
Rank Temperature Year
1 94 °F 1908
2 93 °F 1937
3 92 °F 2005
4 91 °F 2017
5 90 °F 1895
6 89 °F 1920
7 88 °F 2007
8 87 °F 1909
8 87 °F 1926
8 87 °F 1940
8 87 °F 1941
8 87 °F 1984
8 87 °F 1916
What's the all-time low for Waterloo on 9/21?
For the date of Sep 21, the lowest temperature ever reached in Waterloo history is 27 °F which happened in 1918.
Lowest Temperatures in Waterloo on September 21
Rank Temperature Year
1 27 °F 1918
2 31 °F 1974
3 32 °F 1999
3 32 °F 1982
5 34 °F 1991
5 34 °F 1995
5 34 °F 1983
8 35 °F 1952
8 35 °F 1942
10 36 °F 2000
10 36 °F 1997
Lowest High Temperatures in Waterloo on September 21
Rank Temperature Year
1 51 °F 1983
1 51 °F 1934
1 51 °F 1913
4 52 °F 1995
5 54 °F 1975
6 57 °F 1915
6 57 °F 2003
6 57 °F 1985
9 58 °F 1927
10 60 °F 1912
10 60 °F 1974
10 60 °F 1950
What's the most it has ever rained in Waterloo on 9/21?
For the date of Sep 21, the most precipitation ever recorded in Waterloo history is 3.08 inches which happened in 1950.
All-Time Most Precipitation in Waterloo on September 21
Rank Precipitation Year
1 3.08 inches 1950
2 1.91 inches 1960
3 1.59 inches 1973
4 0.74 inches 2009
5 0.61 inches 1955
6 0.58 inches 1965
7 0.51 inches 1994
8 0.50 inches 1931
9 0.40 inches 1921
10 0.38 inches 2007
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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