POET Biorefining - Big Stone

	County Forecast for Big Stone City , SD

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312300-
Grant-
Including the city of Milbank
1007 AM CDT Mon Aug 31 2026

Rest of today   Mostly sunny. Highs in the lower 80s. Northwest winds around 5 mph.
Tonight   Partly cloudy. Lows around 60. Southwest winds around 5 mph.
Tuesday   Partly sunny in the morning, then becoming mostly cloudy. Highs in the upper 70s. Northwest winds around 5 mph, becoming northeast in the afternoon.
Tuesday night   Showers likely, mainly in the evening. Lows around 60. Northwest winds around 5 mph, becoming east around 5 mph after midnight. Chance of rain 70 percent.
Wednesday   Partly sunny. Highs in the lower 80s. Southeast winds 5 to 10 mph.
Wednesday night   Mostly clear in the evening, then partly cloudy with a chance of thunderstorms after midnight. Lows in the lower 60s. Chance of rain 40 percent.
Thursday   Partly sunny. Highs in the mid 80s.
Thursday night through friday night   Mostly clear. Lows in the upper 60s. Highs in the upper 80s.
Saturday   Partly sunny. A slight chance of showers in the afternoon. Highs in the mid 80s. Chance of rain 20 percent.
Saturday night   Mostly clear with a slight chance of showers in the evening, then partly cloudy with a chance of showers after midnight. Lows in the mid 60s. Chance of rain 30 percent.
Sunday   Partly sunny with a 20 percent chance of showers. Highs in the lower 80s.

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Bryce Anderson – DTN Meteorologist

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Summer Ending Hot for Much of the Country

Extreme temperatures for Southern Plains, southwestern Corn Belt. Showers, thunderstorms possible north. » More DTN Weather Commentary

Posted at 5:36AM Mon Aug 31, 2026 CDT

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