Free Long Range Weather Forecast for Rapid City, South Dakota September 2021. (KEVN) - After 100-degree temperatures Saturday, Tuesday weather set some new records. Average Weather in September at Rapid City Regional Airport South Dakota, United States. 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.. Rapid City people will see temperatures in the 60s today. RAPID CITY, S.D. September and October will have below-normal temperatures, with precipitation below normal in the north and above normal in the south. 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. 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. 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. Rainfall will be near to below normal. The average first freeze in Rapid City is October 4 and late August through September in the Black Hills. In Rapid City, there are 3 comfortable months with high temperatures in the range of 70-85°. Calendar overview of Months Weather Forecast. The most pleasant months of the year for Rapid City are June, September and August. In Rapid City, there are 3 comfortable months with high temperatures in the range of 70-85°. 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. Months with the lowest UV index are January and December (UV index 1). high of 47˚ with a low of 23˚. 2020-2021 Long Range Weather Forecast for Rapid City, SD . Rapid City, SD . 2020-2021 Long Range Weather Forecast for Rapid City, SD ... and early to mid-August. Temperature In Rapid City, the average high-temperature drops, from a moderately hot 75.6°F (24.2°C) in September, to … The numbers here tell you how hot and cold the weather usually is in Rapid City, South Dakota during each month of the year. Would you like to add this location to your favourites? Free Long Range Weather Forecast for Rapid City, South Dakota. 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. 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). 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