Waterloo August 21 Weather Records

Daily averages and all-time records for weather in Waterloo, Iowa for the date of August 21.
August 21 All-Time Records
1895–2024
Highest temperature 101 °F 1916
Lowest temperature 39 °F 2004
Lowest daily high 69 °F 1965
Highest daily low 75 °F 1947
Most precipitation 1.29 inches 1920
Most snow none -
August 21 Average Weather
1991–2020 1
Average high 81.4 °F
Average low 59.0 °F
Chance precipitation 28.3%
Chance snow 0%
Waterloo August 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 95 70 0.00 0.0
2022 78 62 0.00 0.0
2021 81 59 0.44 0.0
2020 88 58 0.00 0.0
2019 79 61 0.00 0.0
2018 70 55 0.00 0.0
2017 78 63 0.65 0.0
2016 74 54 0.00 0.0
2015 82 57 0.00 0.0
2014 85 70 0.08 0.0
2013 86 69 0.06 0.0
2012 81 45 0.00 0.0
2011 83 57 0.00 0.0
2010 90 66 0.00 0.0
2009 71 57 0.07 0.0
2008 71 63 0.20 0.0
2007 85 68 0.49 0.0
2006 82 53 0.00 0.0
2005 78 57 0.00 0.0
2004 72 39 0.00 0.0
2003 89 62 0.00 0.0
2002 88 68 0.20 0.0
2001 79 60 0.00 0.0
2000 80 60 0.00 0.0
1999 76 58 0.08 0.0
1998 82 68 0.00 0.0
1997 79 50 0.00 0.0
1996 91 65 0.00 0.0
1995 87 61 0.00 0.0
1994 78 52 0.00 0.0
1993 79 58 0.00 0.0
1992 79 55 0.00 0.0
1991 85 62 0.00 0.0
1990 71 62 0.00 0.0
1989 86 59 0.00 0.0
1988 89 62 0.00 0.0
1987 90 66 0.00 0.0
1986 78 59 0.00 0.0
1985 77 50 0.00 0.0
1984 77 57 0.01 0.0
1983 88 74 0.02 0.0
1982 82 55 0.00 0.0
1981 79 50 0.00 0.0
1980 81 60 0.00 0.0
1979 78 66 0.76 0.0
1978 74 57 0.35 0.0
1977 76 54 0.00 0.0
1976 90 58 0.00 0.0
1975 91 74 0.00 0.0
1974 88 68 0.00 0.0
1973 72 55 0.18 0.0
1972 88 70 0.07 0.0
1971 86 61 0.00 0.0
1970 79 45 0.00 0.0
1969 78 55 0.00 0.0
1968 90 71 0.00 0.0
1967 79 55 0.00 0.0
1966 72 60 0.36 0.0
1965 69 58 0.14 0.0
1964 80 59 0.00 0.0
1963 85 56 0.00 0.0
1962 89 57 0.00 0.0
1961 75 52 0.00 0.0
1960 84 59 0.00 0.0
1959 89 71 0.59 0.0
1958 77 57 0.00 0.0
1957 81 60 0.00 0.0
1956 77 47 0.00 0.0
1955 97 68 0.00 0.0
1954 81 62 0.00 0.0
1953 82 50 0.00 0.0
1952 78 57 0.15 0.0
1951 70 51 0.76 0.0
1950 71 43 0.00 0.0
1949 81 47 0.00 0.0
1948 90 69 0.00 0.0
1947 97 75 0.00 0.0
1946 81 59 0.00 0.0
1945 76 61 n/a 0.0
1944 81 60 n/a 0.0
1943 82 61 0.00 0.0
1942 90 68 n/a 0.0
1941 74 61 n/a 0.0
1940 80 49 n/a 0.0
1939 77 54 0.47 0.0
1938 86 54 n/a 0.0
1937 81 57 0.33 0.0
1936 98 68 0.27 0.0
1935 78 53 0.00 0.0
1934 84 55 0.00 0.0
1933 75 63 n/a 0.0
1932 81 54 0.00 0.0
1931 85 50 0.00 0.0
1930 81 46 0.00 0.0
1929 87 61 0.00 0.0
1928 80 62 0.40 0.0
1927 80 49 n/a 0.0
1926 90 58 0.00 0.0
1925 78 45 0.00 0.0
1924 93 68 n/a 0.0
1923 77 65 0.44 0.0
1922 84 67 n/a 0.0
1921 79 45 n/a 0.0
1920 73 55 1.29 0.0
1919 89 52 0.00 0.0
1918 84 69 0.00 0.0
1917 95 65 0.00 0.0
1916 101 72 0.00 0.0
1915 77 51 0.00 0.0
1914 88 59 0.00 0.0
1913 85 70 0.00 0.0
1912 83 61 0.00 0.0
1911 81 61 n/a 0.0
1910 89 65 0.00 0.0
1909 84 55 n/a 0.0
1908 77 50 0.00 0.0
1907 72 51 n/a 0.0
1906 95 73 0.00 0.0
1905 91 67 n/a 0.0
1904 85 55 n/a 0.0
1903 84 55 0.00 0.0
1902 77 61 0.00 0.0
1901 94 58 0.00 0.0
1900 91 70 n/a 0.0
1899 90 59 0.00 0.0
1898 89 65 0.00 0.0
1897 79 43 0.00 0.0
1896 84 64 0.02 0.0
1895 87 51 n/a 0.0
What's the all-time high for Waterloo on 8/21?
For the date of Aug 21, the highest temperature ever reached in Waterloo history is 101 °F which happened in 1916.
Highest Temperatures in Waterloo on August 21
Rank Temperature Year
1 101 °F 1916
2 98 °F 1936
3 97 °F 1955
3 97 °F 1947
5 95 °F 1917
5 95 °F 1906
5 95 °F 2023
8 94 °F 1901
9 93 °F 1924
10 91 °F 1996
10 91 °F 1975
10 91 °F 1900
10 91 °F 1905
What's the all-time low for Waterloo on 8/21?
For the date of Aug 21, the lowest temperature ever reached in Waterloo history is 39 °F which happened in 2004.
Lowest Temperatures in Waterloo on August 21
Rank Temperature Year
1 39 °F 2004
2 43 °F 1950
2 43 °F 1897
4 45 °F 2012
4 45 °F 1921
4 45 °F 1925
4 45 °F 1970
8 46 °F 1930
9 47 °F 1956
9 47 °F 1949
Lowest High Temperatures in Waterloo on August 21
Rank Temperature Year
1 69 °F 1965
2 70 °F 1951
2 70 °F 2018
4 71 °F 2009
4 71 °F 2008
4 71 °F 1990
4 71 °F 1950
8 72 °F 2004
8 72 °F 1907
8 72 °F 1966
8 72 °F 1973
What's the most it has ever rained in Waterloo on 8/21?
For the date of Aug 21, the most precipitation ever recorded in Waterloo history is 1.29 inches which happened in 1920.
All-Time Most Precipitation in Waterloo on August 21
Rank Precipitation Year
1 1.29 inches 1920
2 0.76 inches 1951
2 0.76 inches 1979
4 0.65 inches 2017
5 0.59 inches 1959
6 0.49 inches 2007
7 0.47 inches 1939
8 0.44 inches 2021
8 0.44 inches 1923
10 0.40 inches 1928
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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