State forecast for S.D.

Today...Mostly sunny west. Decreasing clouds east with a chance of thunderstorms far east. Highs in the upper 70s to mid 80s.

Tonight...Mostly clear. Lows in the 50s.

Saturday...Mostly clear east to partly cloudy west. Chance of thunderstorms developing west in the afternoon and evening with chances spreading into the east after midnight. Highs in the mid to upper 80s.

Sunday...Mostly cloudy with a chance of thunderstorms. Lows in the mid 50s far west to the mid 60s southeast. Highs in the 80s.

Monday...Partly cloudy south to mostly cloudy north. Slight chance of thunderstorms. Lows in the upper 50s west to the upper 60s southeast. Highs in the lower 80s northwest to the lower 90s southeast.

Tuesday...Partly cloudy with a chance of thunderstorms. Lows from the upper 50s northwest to around 70 southeast. Highs from 80 to 85 north to the lower 90s south.