Rapid City (SD) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Rapid City

Rapid City average temperature chart (Celsius) Rapid City average temperature chart (Fahrenheit)
Average monthly temperatures in Rapid City (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 1.2 3.4 7.4 13.8 19.3 25.1 29.5 28.6 22.7 16.7 7.9 2.5
°F 34.2 38.2 45.4 56.9 66.8 77.1 85.2 83.5 72.9 62.1 46.2 36.5

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Rapid City monthly rainfall chart (mm) Rapid City monthly rainfall chart (inches)
Average monthly rainfall in Rapid City (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 8 12 24 50 80 79 62 48 30 26 12 11
inches 0.3 0.5 0.9 2 3.1 3.1 2.4 1.9 1.2 1 0.5 0.4
Rainy days 7 7 9 10 12 12 9 8 7 5 6 7

Average annual rainfall in Rapid City: 382.133mm (150.4 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Rapid City

Rapid City average daily sunshine chart
Average daily sunshine Rapid City
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.9 6.9 8.1 8.8 9.5 11.1 11.6 11.2 9.4 7.9 5.8 5.5

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Rapid City average minimum / maximum temperatures (Celsius) Rapid City average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Rapid City (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -12.2 -10 -6 -0.2 5.8 11 14.7 13 7.1 1.5 -5.4 -10.6
Max °C 1.6 3.8 7.8 14.2 19.7 25.4 29.9 29 23.1 17.1 8.2 2.8
Min °F 10.1 14.1 21.3 31.7 42.4 51.8 58.5 55.4 44.8 34.7 22.3 12.9
Max °F 22.5 26.4 33.6 44.6 54.9 64.8 72.1 69.8 59.2 48.7 34.5 25

Sea temperature

The graph below shows the average sea temperature.

Rapid City average sea temperature chart (Celsius) Rapid City average sea temperature chart (Fahrenheit)
Average sea temperature around Rapid City in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8 7.9 8.1 8.9 10.1 12 14.3 16.6 15.7 13 10.5 8.8
°F 46.5 46.1 46.7 48 50.2 53.6 57.8 61.8 60.3 55.4 50.9 47.8

Wind speed

The graph below shows the average wind speed.

Rapid City average winspeed by month (km/h) Rapid City average winspeed by month (mph)
Average wind speed in Rapid City (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 19 19 21 22 21 18 17 17 18 18 18 18
mph 12 12 13 14 13 11 11 11 11 11 11 11

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Rapid City relative humidity averages
Average relative humidity in Rapid City
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
64% 65% 64% 59% 61% 61% 56% 53% 54% 55% 63% 65%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Rapid City weather stats

Rapid City weather statistics
Hottest month: July 29.5°C 85.1°F
Driest month: January 8mm 0.3ins
Sunniest month: August 11.2hrs
Coldest month: January 1.2°C 34.2°F
Wettest month: May 80mm 3.1ins
Warmest sea: August 16.6°C 61.9°F
Map showing location of Rapid City (44.08054, -103.23101) Rapid City map pin © Google

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