Average Weather in September in Sturgis South Dakota, United States. In Keystone, South Dakota, the average sunshine is 9h. Visitors make foliage pilgrimages to places like Spearfish Canyon and Sica Hollow State Park to take in the gorgeous transition. The September weather guide for Keystone, South Dakota shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & … The variety of trees in South Dakota become color-changing canvases in the autumn. Most sites also have information on the number of days with wet weather. Relative humidity measures the actual amount of moisture in the air as a percentage of the maximum amount of moisture the air can hold. Temperature In Custer, the average high-temperature in September slightly decreases, from a warm 78.8°F (26°C) in August, to an agreeable 70.2°F (21.2°C).The average low-temperature, in September, is 43.3°F (6.3°C). Note: The average daily UV index of 6 transform into the following instructions: UV index In September, the average daily maximum UV index is 6. The average humidity in September is listed below for places in South Dakota. The tables below give monthly averages for rainfall plus snowfall during September at cities, towns and parks in South Dakota. FALL. Temperature In Lead, South Dakota, the average high-temperature drops, from a warm 78.1°F (25.6°C) in August, to a pleasant 68°F (20°C).In September, the average low-temperature is 45°F (7.2°C). Weather in South Dakota. In South Dakota, there are 3 comfortable months with high temperatures in the range of 70-85°. Hailstorms and occasional tornadoes can descend on the Badlands.. Winters are typically cold with 12 to 24 inches of total snowfall. Rapid City, South Dakota, set a U.S. record for the fastest turnaround between 100 degree temperatures and measurable snow, after it hit 102 degrees … Fall weather tends to be mild with an average daytime high of 57°F (14°C) and low of 44°F (7°C), although temperatures and precipitation can vary. September, the first month of the autumn, in Lead, is still a pleasant month, with average temperature ranging between max 68°F (20°C) and min 45°F (7.2°C). The tables give daily averages along with highest and lowest relative humidity levels. Each place has a total for the amount of precipitation it usually receives this month. precipitation 1" (1.5" above avg. In the Black Hills of South Dakota, 10 to 15 inches of snow was reported from this storm. north, 0.5" below south) December 2020 Long Range Weather Forecast for High Plains; Dates Weather Conditions; Dec 1-2: Sunny, mild: Dec 3-9: Snowy periods, very cold: Dec 10-17: Sunny, mild: Dec 18-23: Rain and snow showers, mild: Dec 24-31: Snowy periods, cold: December: temperature 29° (1° below avg.) Calendar overview of Months Weather Forecast. Weather in Badlands National Park is variable and unpredictable with temperature extremes ranging from 116° F to -40° F. Summers are hot and dry with occasional violent thunderstorms. The most pleasant months of the year for South Dakota are June, September and August. Free Long Range Weather Forecast for Rapid City, South Dakota. A UV Index value of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV radiation for the average person. 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