County Forecast for Big Stone City , SD
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171000-
Grant-
Including the city of Milbank
936 PM CDT Thu Jul 16 2026

Tonight   Mostly clear. Lows in the lower 70s. South winds 5 to 10 mph with gusts up to 20 mph, increasing to 15 to 20 mph with gusts up to 30 mph after midnight.
Friday   Mostly sunny. Hot with highs in the mid 90s. Southwest winds 15 to 20 mph with gusts up to 30 mph, becoming west 10 to 15 mph in the afternoon. Heat index values up to 101.
Friday night   Mostly clear. Humid with lows in the mid 60s. North winds 5 to 10 mph with gusts up to 20 mph.
Saturday   Mostly sunny. Not as warm with highs in the mid 80s. North winds 5 to 10 mph with gusts up to 20 mph.
Saturday night   Partly cloudy. Lows in the mid 60s. Northeast winds 5 to 10 mph, becoming south after midnight.
Sunday   Partly sunny. A slight chance of thunderstorms in the afternoon. Hot with highs in the lower 90s. Chance of rain 20 percent.
Sunday night   Partly cloudy. A chance of thunderstorms in the evening, then a chance of showers with a slight chance of thunderstorms after midnight. Lows in the lower 70s. Chance of rain 40 percent.
Monday and monday night   Mostly clear. Hot. Highs in the lower 90s. Lows in the mid 60s.
Tuesday   Mostly sunny. Not as warm with highs in the upper 70s.
Tuesday night and wednesday   Partly cloudy. Lows in the upper 50s. Highs in the upper 70s.
Wednesday night and thursday   Partly cloudy. A 20 percent chance of thunderstorms. Lows in the lower 60s. Highs in the lower 80s.
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Bryce Anderson – DTN Meteorologist
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