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. Our next trip was the last week of June and the weather was beautiful - high 70's and low 80's and all sunny days. South Dakota, the 17th largest state in the nation, covers so much area that it has several different geographic areas, each with its own weather pattern. Get the latest coronavirus (COVID-19) updates for the USA with current travel advice, statistics and online resources.. Below is the hottest it usually gets at popular destinations in South Dakota.Select a destination to see the best time to go based on your preferred weather. June weather forecast for Mount Rushmore National Memorial, South Dakota. Best time to go to South Dakota. Free Long Range Weather Forecast for Rapid City, South Dakota June 2021. Calendar overview of Months Weather Forecast. Sioux Falls, SD. The weather also varies depending on … Calendar overview of Months Weather Forecast. We have been to the BH on two different occassions in June. Visitors make foliage pilgrimages to places like Spearfish Canyon and Sica Hollow State Park to take in the gorgeous transition. Weather.gov > Sioux Falls, SD > June Tornadoes in South Dakota Tie National Record Temperature In Keystone, the average high-temperature in June increases, from a comfortable 66.2°F (19°C) in May, to a warm 77°F (25°C).The average low-temperature, in Keystone, is 50°F (10°C). June Tornadoes in South Dakota Tie National Record. The most pleasant months of the year for South Dakota are June, September and August. The year we came in early June we had 3 straight days of all day rains and cool weather. A powerful upper-level disturbance moving through the Rockies and Plains on June 6, 2020 sparked the development of a line of thunderstorms that brought widespread damaging winds from Utah and Colorado through northeastern Wyoming, western South Dakota, and southwestern North Dakota. The variety of trees in South Dakota become color-changing canvases in the autumn. MITCHELL, S.D. Weather in South Dakota. June has the longest days, with the average temperatures in the 51°F (10.6°C) to 71°F (21.7°C) range. I agree with both Roses and Lohrs. FALL. Free Long Range Weather Forecast for Rapid City, South Dakota. (KELO) — Severe weather moved through south-central KELOLAND Monday night. The first month of the summer, June, is a moderately hot month in Keystone, South Dakota, with average temperature varying between 50°F (10°C) and 77°F (25°C). In South Dakota, there are 3 comfortable months with high temperatures in the range of 70-85°. 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