We have a very mild day in the forecast with highs in the mid 50s near Rapid City and widespread 40s in many areas including Aberdeen, Pierre, and Rapid City. But for the early morning, be aware of some of the frost on the roads and slow down. This will be warmest day of the 7-day forecast, as arctic air lurks just to the north.
Tomorrow will be a transition day with colder winds moving in from North Dakota during the late morning in the north and west. Highs on Saturday will be in the mid 20s as a result in far northern KELOLAND, but Sioux Falls and areas along and south of I-90 will have a fairly nice day again with highs in the mid 30s to near 40.
Strong winds will eventually cover the entire region Saturday night with areas of blowing snow and flurries. Wind gusts will be close to 40 mph from the northwest and wind chills will drop to -20 to -30 into Sunday morning.
Sunday will be frigid as arctic air returns in full strength. Highs will struggle above zero in many areas East River. Slightly warmer weather may return on Monday, but snow chances will also arrive again early next week.