County Forecast for Big Stone City , SD
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230400-
Grant-
Including the city of Milbank
331 PM CDT Mon Jun 22 2026

Tonight   Mostly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the upper 50s. Southeast winds around 5 mph. Chance of rain 30 percent.
Tuesday   Showers with a chance of thunderstorms. Highs in the mid 70s. South winds 10 to 15 mph, becoming southwest in the afternoon. Chance of rain 80 percent.
Tuesday night   Partly cloudy with a chance of thunderstorms in the evening, then mostly clear after midnight. Lows in the mid 50s. West winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 50 percent.
Wednesday   Mostly sunny. Highs in the lower 70s. Northwest winds 10 to 15 mph with gusts up to 30 mph.
Wednesday night   Partly cloudy in the evening, then clearing. Lows in the lower 50s. Northwest winds 10 to 15 mph with gusts up to 25 mph, diminishing to around 5 mph after midnight.
Thursday   Partly sunny. Highs in the lower 70s.
Thursday night   Partly cloudy in the evening, then mostly cloudy with a chance of showers after midnight. Lows in the mid 50s. Chance of rain 40 percent.
Friday   Showers likely. A slight chance of thunderstorms in the afternoon. Highs around 70. Chance of rain 70 percent.
Friday night and saturday   Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Lows in the upper 50s. Highs in the upper 70s. Chance of rain 40 percent.
Saturday night and sunday   Showers likely with a chance of thunderstorms. Lows in the mid 60s. Highs in the lower 80s. Chance of rain 70 percent.
Sunday night   Mostly clear in the evening, then becoming partly cloudy. A 50 percent chance of thunderstorms. Lows in the lower 60s.
Monday   Partly sunny. A chance of showers with a slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 40 percent.
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Bryce Anderson image
Bryce Anderson – DTN Meteorologist
Front Stalling Across South, Plains System Continues Tuesday
Posted at 12:02PM Mon Jun 22, 2026 CDT
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