Each place has a total for the amount of precipitation it usually receives this month. The variety of trees in South Dakota become color-changing canvases in the autumn. 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 tables give daily averages along with highest and lowest relative humidity levels. 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). UV index In September, the average daily maximum UV index is 6. 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.) The tables below give monthly averages for rainfall plus snowfall during September at cities, towns and parks in South Dakota. 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). Free Long Range Weather Forecast for Rapid City, South Dakota. Average Weather in September in Sturgis South Dakota, United States. north, 0.5" below south) Visitors make foliage pilgrimages to places like Spearfish Canyon and Sica Hollow State Park to take in the gorgeous transition. 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. precipitation 1" (1.5" above avg. 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. The most pleasant months of the year for South Dakota are June, September and August. The first month of the autumn, September, is also an agreeable month in Custer, South Dakota, with average temperature varying between 43.3°F (6.3°C) and 70.2°F (21.2°C). Relative humidity measures the actual amount of moisture in the air as a percentage of the maximum amount of moisture the air can hold. Note: The average daily UV index of 6 transform into the following instructions: In the Black Hills of South Dakota, 10 to 15 inches of snow was reported from this storm. In South Dakota, there are 3 comfortable months with high temperatures in the range of 70-85°. In Keystone, South Dakota, the average sunshine is 9h. 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 … Weather in South Dakota. Parts of the high country of southern and central Colorado picked up 12 to 16 inches of snow. 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