Weather By Day

September Weather In Rapid City  
September Rapid City Weather
Record High: 104°F
Normal High: 75°F
Normal Low: 46°F
Record Low: 18°F
Avg Monthly Rain: 1.1"
Rec 1 Day Rain: 2.13"
Avg Monthly Snow: 0.1"
Rec 1 Day Snow: 2"

Rapid City Weather In September

The hottest September day in Rapid City for the past 68 years was 104 degrees Fahrenheit, most recently encountered on September 5, 1978, and the standard high is 75. The lowest reported temperature in September for Rapid City for the past 68 years was 18 measured on September 30, 1985, and the average low daily temperature is 46.

According to National Weather Service historical Rapid City September Weather data, on September 29, 1985, the high temperature did not exceed 34 degrees Fahrenheit, the lowest high measured in Rapid City in the past 68 years. Weather Service records also indicate that on September 3, 1960, the low temperature for the day was not measured below 73 degrees, the highest low measured in Rapid City in the last 68 years.

National Weather Service records indicate that the high temperature in Rapid City on September First averages 82 degrees and the high on the last day of the month averages 72 degrees. The low temperature in Rapid City in September on the first day of the month averages 53 degrees and the low temperature on the last day of the month averages 42 degrees.

Rapid City typically receives an average of 1.1 inches of rain during the month. The most precipitation measured in a single day, as indicated by September Rapid City Weather data, was 2.13 inches on September 26, 1966. Rapid City receives an average of 0.1 inches of snow in September.On September 13, 1970 Rapid City received 2 inches of precipitation, the highest snowfall recorded in a single day in September.