54. High Temp: 85 °F. You can jump to a separate table for each region of the state: Eastern, Central and Western South Dakota. The average annual temperature for South Dakota is 18° degrees and there is about 528 mm of rain in a year. 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. Climate. The most pleasant months of the year for South Dakota are June, September and August. A climate chart for your city, indicating the monthly high temperatures and rainfall. During the summers, the average high temperature throughout the state is often close to 90 °F or 32.2 °C, although it generally cools down to near 60 °F or 15.6 °C at night. Temperatures can reach over 100*F in the summer and average below freezing in the winter. She added that, in the far west, there is a slightly enhanced chance of warmer than average temperatures over the three summer months. The National Oceanic and Atmospheric Administration’s (NOAA) Climate Prediction Center released their June climate outlook on May 21. With alternating cool and warm weather patterns throughout the last few months and the summer season ahead, temperature continues to be a challenge for climate forecasters in South Dakota. ... South Dakota. It is dry for 198 days a year with an average humidity of 74% and an UV-index of 4. In the latter half of the summer, the western half may shift toward equal chances of wetter, drier or near average moisture.”. South Dakota summers range from warm to hot with the average high temperature of 80°F (26.7°C) to 90°F (32.2°C) in the peak of July whereas nights cool down quickly to register average temperatures of 50°F (10°C) to 60°F (15.6°C). Activist near the US Capitol with sign about South Dakota Climate change in South Dakota encompasses the effects of climate change , attributed to man-made increases in atmospheric carbon dioxide , in the U.S. state of South Dakota . Monthly temperature, precipitation and hours of sunshine. Monthly weather forecast and climate for South Dakota. | Resources. Averages are for Ellsworth Air Force Base, which is 7 miles from Rapid City. The National Oceanic and Atmospheric Administration’s (NOAA) Climate Prediction Center released their June climate outlook on May 21. 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