County Forecast for Big Stone City , SD
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170400-
Grant-
Including the city of Milbank
327 PM CDT Tue Jun 16 2026

Tonight   Mostly cloudy. A chance of showers with a slight chance of thunderstorms this evening, then showers likely with a chance of thunderstorms after midnight. Lows in the mid 50s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 70 percent.
Wednesday   A chance of thunderstorms. Showers, breezy with highs in the upper 60s. West winds 15 to 20 mph, becoming northwest 15 to 25 mph in the afternoon. Chance of rain 90 percent.
Wednesday night   Mostly cloudy. Showers likely with a slight chance of thunderstorms in the evening. Breezy with lows around 50. Northwest winds 15 to 25 mph with gusts up to 35 mph, diminishing to 10 to 15 mph with gusts up to 25 mph after midnight. Chance of rain 70 percent.
Thursday   Partly sunny with a 20 percent chance of showers. Highs in the upper 60s. Northwest winds 10 to 15 mph with gusts up to 25 mph.
Thursday night   Mostly clear. Lows in the upper 40s. Northwest winds 5 to 10 mph with gusts up to 20 mph, becoming west after midnight.
Juneteenth and friday night   Mostly clear. Highs in the mid 70s. Lows in the lower 50s.
Saturday   Partly sunny. Highs in the mid 70s.
Saturday night   Mostly cloudy. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the mid 50s. Chance of rain 40 percent.
Sunday and sunday night   Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Highs in the lower 70s. Lows in the lower 50s. Chance of rain 50 percent.
Monday   Mostly cloudy with a slight chance of showers in the morning, then partly sunny with a slight chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 20 percent.
Monday night   Partly cloudy in the evening, then mostly cloudy with a slight chance of thunderstorms after midnight. Lows in the mid 50s. Chance of rain 20 percent.
Tuesday   Partly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 30 percent.
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Bryce Anderson – DTN Meteorologist
Big Severe Weather Event for Midwest Wednesday

Three active weather systems; severe outbreak Wednesday threatens tornadoes, damaging winds, and large hail Midwest. » More DTN Weather Commentary

Posted at 12:00PM Tue Jun 16, 2026 CDT
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