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Rapid City August 21 Weather Records

Daily averages and all-time records for weather in Rapid City, South Dakota for the date of August 21.
August 21 All-Time Records
1948–2022
Highest temperature 99 °F 2010
Lowest temperature 43 °F 2021
Lowest daily high 60 °F 1964
Highest daily low 66 °F 1988
Most precipitation 0.9 inches 1964
Most snow none -
August 21 Average Weather
1991–2020 1
Average high 85.7 °F
Average low 55.6 °F
Chance precipitation 24.0%
Chance snow 0%
Rapid City August 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2022 94 58 0.00 n/a
2021 80 43 0.00 n/a
2020 91 60 0.00 n/a
2019 78 58 0.00 n/a
2018 66 51 0.01 0.0
2017 80 51 0.00 0.0
2016 87 44 0.00 0.0
2015 87 55 0.00 0.0
2014 81 61 0.02 0.0
2013 84 58 0.00 0.0
2012 92 47 0.00 0.0
2011 85 62 0.00 0.0
2010 99 59 0.00 0.0
2009 77 46 0.00 0.0
2008 97 63 0.00 0.0
2007 83 57 0.00 0.0
2006 91 55 0.00 0.0
2005 89 55 0.00 n/a
2004 93 52 0.00 n/a
2003 84 56 0.00 n/a
2002 80 58 0.06 n/a
2001 95 62 0.00 0.0
2000 82 52 0.00 0.0
1999 88 60 0.25 0.0
1998 89 60 0.08 n/a
1997 81 54 0.00 0.0
1996 83 61 0.00 n/a
1995 98 61 0.00 0.0
1994 95 54 0.00 0.0
1993 89 62 0.00 0.0
1992 76 53 0.00 0.0
1991 95 59 0.00 0.0
1990 94 57 0.20 0.0
1989 91 58 0.00 0.0
1988 84 66 0.00 0.0
1987 85 58 0.00 0.0
1986 72 49 0.04 0.0
1985 88 65 0.00 0.0
1984 85 52 0.00 0.0
1983 88 66 0.60 0.0
1982 90 65 0.00 0.0
1981 90 62 0.00 0.0
1980 81 51 0.00 0.0
1979 74 50 0.05 0.0
1978 89 60 0.00 0.0
1977 82 50 0.00 0.0
1976 92 65 0.00 0.0
1975 86 62 0.00 0.0
1974 77 48 0.00 0.0
1973 95 64 0.15 0.0
1972 73 55 0.01 0.0
1971 96 62 0.00 0.0
1970 89 60 0.00 0.0
1969 94 57 0.00 0.0
1968 87 60 0.00 0.0
1967 90 59 0.00 0.0
1966 64 44 0.06 0.0
1965 74 55 0.01 0.0
1964 60 48 0.92 0.0
1963 86 62 0.09 0.0
1962 99 63 0.00 0.0
1961 78 57 0.36 0.0
1960 92 66 0.00 0.0
1959 97 61 0.00 0.0
1958 81 50 0.00 0.0
1957 94 60 0.00 0.0
1956 86 47 0.00 0.0
1955 86 61 0.00 0.0
1954 87 58 0.00 0.0
1953 89 59 0.00 0.0
1952 88 58 0.05 0.0
1951 77 47 0.00 0.0
1950 77 48 0.00 0.0
1949 96 58 0.00 0.0
1948 92 57 0.00 0.0
All-Time Highest Temperatures in Rapid City on August 21
Rank Temperature Year
1 99 °F 1962
1 99 °F 2010
3 98 °F 1995
4 97 °F 2008
4 97 °F 1959
6 96 °F 1949
6 96 °F 1971
8 95 °F 1994
8 95 °F 2001
8 95 °F 1991
8 95 °F 1973
All-Time Lowest Temperatures in Rapid City on August 21
Rank Temperature Year
1 43 °F 2021
2 44 °F 1966
2 44 °F 2016
4 46 °F 2009
5 47 °F 1956
5 47 °F 1951
5 47 °F 2012
8 48 °F 1964
8 48 °F 1974
8 48 °F 1950
Lowest High Temperatures in Rapid City on August 21
Rank Temperature Year
1 60 °F 1964
2 64 °F 1966
3 66 °F 2018
4 72 °F 1986
5 73 °F 1972
6 74 °F 1965
6 74 °F 1979
8 76 °F 1992
9 77 °F 2009
9 77 °F 1951
9 77 °F 1974
9 77 °F 1950
All-Time Most Precipitation in Rapid City on August 21
Rank Precipitation Year
1 0.9 inches 1964
2 0.6 inches 1983
3 0.4 inches 1961
4 0.3 inches 1999
5 0.2 inches 1990
6 0.1 inches 1973
7 0.1 inches 1963
8 0.1 inches 1998
9 0.1 inches 2002
9 0.1 inches 1966
Weather Station Details
Years Station Coordinates
1948–2022 Rapid City Regional Airport location