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Sioux Falls August 21 Weather Records

Daily averages and all-time records for weather in Sioux Falls, South Dakota for the date of August 21.
August 21 All-Time Records
1932–2022
Highest temperature 98 °F 1968
Lowest temperature 40 °F 2004
Lowest daily high 65 °F 1961
Highest daily low 77 °F 1968
Most precipitation 2.3 inches 2002
Most snow none -
August 21 Average Weather
1991–2020 1
Average high 81.4 °F
Average low 59.7 °F
Chance precipitation 28.4%
Chance snow 0%
Sioux Falls August 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2022 82 56 0.00 0.0
2021 76 57 0.00 0.0
2020 93 69 0.00 0.0
2019 77 59 0.00 0.0
2018 73 54 0.00 0.0
2017 74 63 2.15 0.0
2016 80 49 0.00 0.0
2015 81 62 0.00 0.0
2014 90 69 0.00 0.0
2013 81 71 0.00 0.0
2012 85 49 0.00 0.0
2011 83 52 0.00 0.0
2010 91 65 0.00 0.0
2009 69 54 0.01 0.0
2008 74 65 0.00 0.0
2007 83 62 0.01 0.0
2006 85 58 0.00 0.0
2005 79 54 0.00 0.0
2004 80 40 0.00 0.0
2003 82 59 0.00 0.0
2002 83 66 2.28 0.0
2001 80 65 0.01 0.0
2000 78 65 0.00 0.0
1999 88 66 0.01 0.0
1998 80 65 0.00 0.0
1997 80 48 0.00 0.0
1996 86 67 0.00 0.0
1995 89 59 0.00 0.0
1994 82 49 0.00 0.0
1993 81 61 0.00 0.0
1992 82 65 0.00 0.0
1991 89 59 0.00 0.0
1990 74 62 0.00 0.0
1989 83 61 0.09 0.0
1988 90 66 1.60 0.0
1987 89 65 0.00 0.0
1986 73 44 0.00 0.0
1985 77 60 0.00 0.0
1984 85 63 0.11 0.0
1983 93 69 0.00 0.0
1982 85 56 0.00 0.0
1981 85 62 0.00 0.0
1980 82 58 0.00 0.0
1979 79 61 0.17 0.0
1978 86 68 0.00 0.0
1977 77 57 0.00 0.0
1976 95 70 0.00 0.0
1975 85 68 2.12 0.0
1974 77 59 0.07 0.0
1973 90 67 0.06 0.0
1972 82 63 0.23 0.0
1971 92 66 0.00 0.0
1970 74 56 0.01 0.0
1969 77 65 0.00 0.0
1968 98 77 0.00 0.0
1967 85 57 0.00 0.0
1966 69 54 0.01 0.0
1965 75 55 0.41 0.0
1964 73 50 0.16 0.0
1963 90 62 0.00 0.0
1962 90 60 0.00 0.0
1961 65 56 0.16 0.0
1960 87 61 0.00 0.0
1959 98 70 0.38 0.0
1958 79 51 0.00 0.0
1957 81 63 0.00 0.0
1956 80 50 0.00 0.0
1955 91 61 0.00 0.0
1954 81 67 0.00 0.0
1953 84 57 0.00 0.0
1952 82 51 0.00 0.0
1951 70 49 0.00 0.0
1950 81 47 0.00 0.0
1949 81 57 0.00 0.0
1948 86 54 0.00 0.0
1947 98 77 0.00 0.0
1946 79 62 0.00 0.0
1945 70 51 0.30 0.0
1944 80 63 0.02 0.0
1943 82 62 0.12 0.0
1942 94 73 0.00 0.0
1941 85 62 0.00 0.0
1940 78 58 0.07 0.0
1939 77 47 0.00 0.0
1938 87 55 0.00 0.0
1937 79 54 0.00 0.0
1936 81 68 0.15 0.0
1935 79 54 0.00 0.0
1934 78 55 0.00 0.0
1933 70 61 0.33 0.0
1932 82 61 0.00 0.0
All-Time Highest Temperatures in Sioux Falls on August 21
Rank Temperature Year
1 98 °F 1947
1 98 °F 1968
1 98 °F 1959
4 95 °F 1976
5 94 °F 1942
6 93 °F 1983
6 93 °F 2020
8 92 °F 1971
9 91 °F 2010
9 91 °F 1955
All-Time Lowest Temperatures in Sioux Falls on August 21
Rank Temperature Year
1 40 °F 2004
2 44 °F 1986
3 47 °F 1939
3 47 °F 1950
5 48 °F 1997
6 49 °F 1951
6 49 °F 1994
6 49 °F 2012
6 49 °F 2016
10 50 °F 1956
10 50 °F 1964
Lowest High Temperatures in Sioux Falls on August 21
Rank Temperature Year
1 65 °F 1961
2 69 °F 1966
2 69 °F 2009
4 70 °F 1933
4 70 °F 1945
4 70 °F 1951
7 73 °F 1964
7 73 °F 1986
7 73 °F 2018
10 74 °F 2017
10 74 °F 1970
10 74 °F 2008
10 74 °F 1990
All-Time Most Precipitation in Sioux Falls on August 21
Rank Precipitation Year
1 2.3 inches 2002
2 2.1 inches 2017
3 2.1 inches 1975
4 1.6 inches 1988
5 0.4 inches 1965
6 0.4 inches 1959
7 0.3 inches 1933
8 0.3 inches 1945
9 0.2 inches 1972
10 0.2 inches 1979
Weather Station Details
Years Station Coordinates
1932–2022 Sioux Falls location