Rapid City August Weather

Averages and records for weather in Rapid City, South Dakota in the month of August.
Typical Rapid City August Weather
1991–2020
Average daily high 86.0 °F
Average daily low 56.4 °F
Average monthly precipitation 1.6 inches
Average monthly snow none
Daily chance of precipitation 25.5%
Daily chance of snow 0%
Rapid City August Weather Records
1948–2024
Highest temperature 107 °F August 29, 2012
Lowest temperature 37 °F August 31, 2020
Highest daily low 73 °F August 1, 1964
Lowest daily high 51 °F August 31, 1994
Hottest average high temperature 92.0 °F 1961
Coldest average high temperature 79.1 °F 1966
Most daily precipitation 2.6 inches August 4, 1982
Most monthly precipitation 4.8 inches 1982
Most daily snow none -
Most monthly snow none -
Note: Daily averages are a moving average which includes 14 days before and after
Day Average (°F) Record (°F)
High Low High Low
August 1 87.0 58.2 102 42
August 2 86.8 58.1 100 47
August 3 86.7 57.9 102 42
August 4 86.6 57.7 103 45
August 5 86.4 57.5 103 45
August 6 86.4 57.4 104 50
August 7 86.4 57.3 105 45
August 8 86.4 57.2 103 48
August 9 86.4 57.1 102 47
August 10 86.4 57.0 103 43
August 11 86.4 56.9 103 40
August 12 86.4 56.9 105 45
August 13 86.4 56.8 107 43
August 14 86.3 56.7 100 47
August 15 86.1 56.6 106 47
August 16 86.1 56.4 101 45
August 17 85.9 56.3 105 39
August 18 85.8 56.1 104 43
August 19 85.8 56.0 104 41
August 20 85.8 55.8 104 42
August 21 85.7 55.6 99 43
August 22 85.5 55.4 104 38
August 23 85.3 55.1 104 38
August 24 85.1 54.8 101 41
August 25 84.8 54.6 103 42
August 26 84.5 54.2 103 43
August 27 84.3 53.9 103 42
August 28 84.1 53.7 100 41
August 29 83.8 53.4 107 41
August 30 83.5 53.1 102 38
August 31 83.2 52.8 103 37
Weather Station Details
Years Station Coordinates
1948–2024 Rapid City Regional Airport location