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Rapid City September 20 Weather Records

Daily averages and all-time records for weather in Rapid City, South Dakota for the date of September 20.
September 20 All-Time Records
1948–2022
Highest temperature 93 °F 1960
Lowest temperature 29 °F 1983
Lowest daily high 45 °F 1995
Highest daily low 58 °F 2007
Most precipitation 1.8 inches 1955
Most snow none -
September 20 Average Weather
1991–2020 1
Average high 73.8 °F
Average low 44.5 °F
Chance precipitation 23.1%
Chance snow 0.6%
Rapid City September 20 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2022 77 53 0.00 n/a
2021 66 42 0.05 n/a
2020 80 49 0.00 n/a
2019 79 57 0.06 n/a
2018 62 46 0.36 0.0
2017 73 34 0.00 0.0
2016 83 53 0.00 0.0
2015 84 42 0.00 0.0
2014 78 50 0.00 0.0
2013 73 34 0.00 0.0
2012 78 43 0.00 0.0
2011 64 39 0.00 0.0
2010 86 47 0.00 0.0
2009 79 50 0.31 0.0
2008 85 44 0.00 0.0
2007 91 58 0.00 0.0
2006 69 35 0.00 0.0
2005 89 46 0.00 n/a
2004 62 47 0.06 n/a
2003 77 42 0.00 n/a
2002 71 42 0.00 n/a
2001 72 43 0.00 n/a
2000 61 43 0.00 0.0
1999 67 34 0.00 0.0
1998 54 46 0.30 0.0
1997 58 34 0.00 0.0
1996 59 44 0.01 0.0
1995 45 30 0.25 0.0
1994 83 53 0.00 0.0
1993 75 39 0.00 0.0
1992 87 54 0.00 0.0
1991 87 40 0.00 0.0
1990 64 45 0.00 0.0
1989 62 51 1.18 0.0
1988 68 32 0.00 0.0
1987 72 39 0.00 0.0
1986 56 50 0.05 0.0
1985 63 32 0.00 0.0
1984 78 47 0.00 0.0
1983 50 29 0.00 0.0
1982 65 35 0.00 0.0
1981 73 46 0.00 0.0
1980 75 51 0.00 0.0
1979 73 48 0.00 0.0
1978 59 36 0.00 0.0
1977 86 48 0.00 0.0
1976 75 38 0.00 0.0
1975 58 36 0.00 0.0
1974 64 41 0.00 0.0
1973 81 44 0.00 0.0
1972 70 41 0.00 0.0
1971 63 37 0.07 0.0
1970 82 45 0.00 0.0
1969 87 51 0.00 0.0
1968 78 47 0.00 0.0
1967 75 44 0.00 0.0
1966 83 50 0.00 0.0
1965 58 36 0.00 0.0
1964 73 38 0.00 0.0
1963 68 48 0.00 0.0
1962 75 46 0.00 0.0
1961 68 35 0.00 0.0
1960 93 51 0.00 0.0
1959 74 52 0.00 0.0
1958 70 41 0.00 0.0
1957 61 35 0.00 0.0
1956 91 45 0.00 0.0
1955 68 53 1.83 0.0
1954 63 39 0.00 0.0
1953 63 39 0.00 0.0
1952 69 47 0.00 0.0
1951 57 41 0.11 0.0
1950 58 50 1.36 0.0
1949 71 41 0.00 0.0
1948 67 47 0.05 0.0
All-Time Highest Temperatures in Rapid City on September 20
Rank Temperature Year
1 93 °F 1960
2 91 °F 1956
2 91 °F 2007
4 89 °F 2005
5 87 °F 1969
5 87 °F 1991
5 87 °F 1992
8 86 °F 2010
8 86 °F 1977
10 85 °F 2008
All-Time Lowest Temperatures in Rapid City on September 20
Rank Temperature Year
1 29 °F 1983
2 30 °F 1995
3 32 °F 1988
3 32 °F 1985
5 34 °F 1997
5 34 °F 2013
5 34 °F 2017
5 34 °F 1999
9 35 °F 1957
9 35 °F 1982
9 35 °F 2006
9 35 °F 1961
Lowest High Temperatures in Rapid City on September 20
Rank Temperature Year
1 45 °F 1995
2 50 °F 1983
3 54 °F 1998
4 56 °F 1986
5 57 °F 1951
6 58 °F 1997
6 58 °F 1950
6 58 °F 1975
6 58 °F 1965
10 59 °F 1996
10 59 °F 1978
All-Time Most Precipitation in Rapid City on September 20
Rank Precipitation Year
1 1.8 inches 1955
2 1.4 inches 1950
3 1.2 inches 1989
4 0.4 inches 2018
5 0.3 inches 2009
6 0.3 inches 1998
7 0.3 inches 1995
8 0.1 inches 1951
9 0.1 inches 1971
10 0.1 inches 2019
10 0.1 inches 2004
Weather Station Details
Years Station Coordinates
1948–2022 Rapid City Regional Airport location