The average first freeze in Rapid City is October 4 and late August through September in the Black Hills. 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. The most pleasant months of the year for Rapid City are June, September and August. October, like September, in Rapid City, South Dakota, is another comfortable autumn month, with average temperature ranging between min 34.2°F (1.2°C) and max 61.3°F (16.3°C). Average Weather in September at Rapid City Regional Airport South Dakota, United States. We will review the data in question. 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. Calendar overview of Months Weather Forecast. The most pleasant months of the year for Rapid City are June, September and August. Months with the lowest UV index are January and December (UV index 1). To see the best color, make sure you go to Spearfish Canyon in the northern hills, up near Lead and Deadwood.We try to come in the fall every year. Rapid City people will see temperatures in the 60s today. September and October will have below-normal temperatures, with precipitation below normal in the north and above normal in the south. Free Long Range Weather Forecast for Rapid City, South Dakota September 2021. (KEVN) - After 100-degree temperatures Saturday, Tuesday weather set some new records. September sees an average high of 73˚ with a low of 45˚; October averages a high of 60˚ and a low of 34˚; November sees an avg. Free Long Range Weather Forecast for Rapid City, South Dakota. In Rapid City, there are 3 comfortable months with high temperatures in the range of 70-85°. This was the earliest measurable snow Rapid City has seen in September since 2014. The numbers here tell you how hot and cold the weather usually is in Rapid City, South Dakota during each month of the year. In Rapid City, there are 3 comfortable months with high temperatures in the range of 70-85°. RAPID CITY, S.D. Temperature In Rapid City, the average high-temperature drops, from a moderately hot 75.6°F (24.2°C) in September, to … Rainfall will be near to below normal. Would you like to add this location to your favourites? Calendar overview of Months Weather Forecast. Rapid City, SD . 2020-2021 Long Range Weather Forecast for Rapid City, SD . The average high and low temperatures are listed below monthly and annually for the city, in both degrees Fahrenheit and Celsius. high of 47˚ with a low of 23˚. 2020-2021 Long Range Weather Forecast for Rapid City, SD ... and early to mid-August. 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