September weather forecast and climate
South Dakota, USA

Flag of South Dakota, USA
Flag of South Dakota, USA

Weather in September

September begins the beautiful autumn season of South Dakota with its green prairie, forests, riversides, and mountains sprinkled in various shades of yellow, orange, red, and golden colors.
The temperatures are moderate, and the average is between 45°F (7.2°C) to 75°F (23.9°C). Rain is to the tune of 2" (51mm) to 3" (76mm), and clouds cover the skies between many sunny days. Early fall is colder than the summer, especially during the midday, and high temperatures rarely rise above 90°F (32.2°C).
All the mountain trails are open, the hunting and growing season are in full swing, and the weather is generally pleasant. An occasional thunderstorm makes its way through the southeast, but it is usually short-lived. The prairie is windy, as the vast plains have scattered mountain ranges and butte - steep flattop hills.
September is a great time to visit the Badlands National Park - start in the early morning as the weather changes between sunshine and cloudy!
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