County Forecast for Big Stone City , SD
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290800-
Grant-
Including the city of Milbank
736 PM CDT Sun Jun 28 2026

..heat advisory in effect from noon to 8 pm cdt monday   
Tonight   Mostly cloudy. A slight chance of thunderstorms this evening. Patchy fog and smoke after midnight. Lows around 70. East winds 5 to 10 mph. Chance of rain 20 percent.
Monday   Partly sunny. A slight chance of showers in the morning. Patchy fog and smoke in the morning. Breezy, hot with highs in the mid 90s. Southeast winds 15 to 20 mph, becoming south 20 to 25 mph in the afternoon. Chance of rain 20 percent. Heat index values up to 103 in the afternoon.
Monday night   Mostly clear. Less humid with lows in the mid 60s. Southwest winds 15 to 20 mph. Gusts up to 35 mph in the evening.
Tuesday   Sunny. Highs in the upper 80s. Southwest winds 10 to 15 mph with gusts up to 30 mph.
Tuesday night   Mostly clear with a slight chance of showers in the evening, then partly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows in the mid 60s. West winds 10 to 15 mph with gusts up to 25 mph, becoming southwest around 5 mph after midnight. Chance of rain 40 percent.
Wednesday   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 upper 80s. Chance of rain 50 percent.
Wednesday night   Partly cloudy. A chance of thunderstorms in the evening. Lows in the mid 60s. Chance of rain 50 percent.
Thursday   Partly sunny. A slight chance of thunderstorms in the afternoon. Hot with highs in the lower 90s. Chance of rain 20 percent.
Thursday night   Showers likely with a chance of thunderstorms in the evening, then mostly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows in the upper 60s. Chance of rain 70 percent.
Friday   Partly sunny. Hot with highs in the lower 90s.
Friday night through saturday night   Partly cloudy with a 50 percent chance of thunderstorms. Hot. Lows in the upper 60s. Highs around 90.
Sunday   Partly sunny. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent.
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Bryce Anderson image
Bryce Anderson – DTN Meteorologist
Heatwave Starts This Weekend, Continues Through Next Week
Posted at 12:03PM Fri Jun 26, 2026 CDT
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