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.) In Keystone, South Dakota, the average sunshine is 9h. precipitation 1" (1.5" above avg. Hailstorms and occasional tornadoes can descend on the Badlands.. Winters are typically cold with 12 to 24 inches of total snowfall. 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. Note: The average daily UV index of 6 transform into the following instructions: 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). 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). The variety of trees in South Dakota become color-changing canvases in the autumn. Each place has a total for the amount of precipitation it usually receives this month. 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). Parts of the high country of southern and central Colorado picked up 12 to 16 inches of snow. The tables below give monthly averages for rainfall plus snowfall during September at cities, towns and parks in South Dakota. Visitors make foliage pilgrimages to places like Spearfish Canyon and Sica Hollow State Park to take in the gorgeous transition. Weather in South Dakota. UV index In September, the average daily maximum UV index is 6. In South Dakota, there are 3 comfortable months with high temperatures in the range of 70-85°. 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). FALL. The most pleasant months of the year for South Dakota are June, September and August. Average Weather in September in Sturgis South Dakota, United States. 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. Free Long Range Weather Forecast for Rapid City, South Dakota. 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 & … In the Black Hills of South Dakota, 10 to 15 inches of snow was reported from this storm. Calendar overview of Months Weather Forecast. 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