The most pleasant months of the year for Rapid City are June, September and August. In July, the warmest month, the average day time temperature rises to 85.5°F. The best times to visit Rapid City for ideal weather are. Thunderstorms produce less rainfall, and drier conditions increase the wildfire potential in the Black Hills. Temperature by: Fahrenheit / Centigrade Relative humidity is probalby the second most popular factor that people take into consideration when looking for the weather of a city to live in. CityRating.com now offers an average city relative humidity chart that displays the annual and monthly humidity for dozens of cities. Even the driest month still has a lot of rainfall. South Dakota, the 17th largest state in the nation, covers so much area that it has several different geographic areas, each with its own weather pattern. July is the hottest month for Rapid City with an average high temperature of 85.3°, which ranks it as about average compared to other places in South Dakota. May 28th to October 7th. Rapid City. There is significant rainfall throughout the year in Rapid City. Monthly averages Rapid City-Ellsworth AFB Longitude: -103.1, Latitude: 44.15 Average weather Rapid City-Ellsworth AFB, SD - 57769. Station Data. Rapid City climate summary The Rapid City lies on 990m above sea level In Rapid City, the climate is cold and temperate. Relative humidity of US cities including average monthly and annual data in a city by city listing. … In Rapid City, there are 3 comfortable months with high temperatures in the range of 70-85°. Humidity The average relative humidity in Rapid City is 62.2%. Rapid City's coldest month is January when the average temperature overnight is 11.3°F. Low temperatures average in the 50s, although 40s--and even 30s--can occur at the higher elevations like Deerfield. This location is classified as Dfa by Köppen and Geiger. The tables below display average monthly climate and weather indicators in Rapid City South Dakota. To access climate data beyond 2 months, Please contact the National Climatic Data Center. Monthly: 1981-2010 normals Tornado activity: Rapid City-area historical tornado activity is significantly below South Dakota state average.It is 57% smaller than the overall U.S. average.. On 5/11/1991, a category F3 (max. In Rapid City, South Dakota, the average low-temperature is 22.1°F (-5.5°C). Read below for more weather and travel details. DAILY CLIMATE REPORT - issued daily: Detailed daily weather statistics (usually for yesterday), including temperature, precipitation, degree days, wind, humidity, sunrise/sunset, and record temperature data for the following day. Rainfall In Rapid City, during November, the rain falls for 5.3 days and regularly aggregates up to 0.5" (13.5mm) of precipitation. 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