Calendar overview of Months Weather Forecast. In Rapid City, there are 3 comfortable months with high temperatures in the range of 70-85°. 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). 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. Calendar overview of Months Weather Forecast. Rainfall will be near to below normal. This was the earliest measurable snow Rapid City has seen in September since 2014. RAPID CITY, S.D. 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. Over the course of September in Rapid City, the length of the day is rapidly decreasing.From the start to the end of the month, the length of the day decreases by 1 hour, 27 minutes, implying an average daily decrease of 2 minutes, 59 seconds, and weekly decrease of 20 minutes, 56 seconds.. 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. The most pleasant months of the year for Rapid City are June, September and August. Average Weather in September at Rapid City Regional Airport South Dakota, United States. The numbers here tell you how hot and cold the weather usually is in Rapid City, South Dakota during each month of the year. The average first freeze in Rapid City is October 4 and late August through September in the Black Hills. 2020-2021 Long Range Weather Forecast for Rapid City, SD . Rapid City people will see temperatures in the 60s today. high of 47˚ with a low of 23˚. The average high and low temperatures are listed below monthly and annually for the city, in both degrees Fahrenheit and Celsius. We will review the data in question. In Rapid City, there are 3 comfortable months with high temperatures in the range of 70-85°. September and October will have below-normal temperatures, with precipitation below normal in the north and above normal in the south. The most pleasant months of the year for Rapid City are June, September and August. Would you like to add this location to your favourites? 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. Free Long Range Weather Forecast for Rapid City, South Dakota. Rapid City, SD . Months with the lowest UV index are January and December (UV index 1). Free Long Range Weather Forecast for Rapid City, South Dakota September 2021. 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