Records for Rapid City Downtown Area, South Dakota (UNRS2thr) on 09-30
  Record Highs
  
    - 
      1:  91°F (1963)
    
- 
      2:  90°F (1967)
    
- 
      3:  90°F (1953)
    
 
  Record Lows
  
    - 
      1:  26°F (1961)
    
- 
      2:  29°F (1959)
    
- 
      3:  29°F (1895)
    
 
  Lowest Highs
  
    - 
      1:  61°F (2022)
    
- 
      2:  59°F (2005)
    
- 
      3:  57°F (1889)
    
 
  Highest Lows
  
    - 
      1:  42°F (2018)
    
- 
      2:  43°F (1907)
    
- 
      3:  45°F (1950)
    
 
  Highest September temperature:
  
  103°F on 09-02-1960.
  Lowest September temperature:
  
  15°F on 09-25-1926.
  Average temperature is 55.6°F
  Average high is 66.4°F
  Average low is 44.7°F
 
  Temperature data from 1888 to 2022.
  Record Precipitation
  
    - 
      1:  1.22" (2014)
    
- 
      2:  0.46" (1962)
    
- 
      3:  0.44" (1918)
    
 
  Precipitation data from 1888 to 2022.