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Grenville, SD Weather Forecast
Grenville, SD Weather Forecast Date: 1221 PM CDT Wed Sep 09 2026
The area/counties/county of: Day, including the city of Webster.or toggle through each period.
This Afternoon... Sunny. Highs in the lower 70s. Northwest winds 10 to 15 mph with gusts up to 25 mph.
Tonight... Mostly clear. Lows in the lower 50s. West winds 5 to 10 mph with gusts up to 20 mph, becoming south after midnight.
Thursday... Sunny. Highs in the lower 80s. Southwest winds 5 to 10 mph with gusts up to 20 mph, increasing to around 15 mph with gusts up to 30 mph in the afternoon.
Thursday Night... Mostly clear. Not as cool with lows in the mid 60s. South winds 15 to 20 mph with gusts up to 30 mph.
Friday... Mostly sunny. A slight chance of showers in the afternoon. Highs in the mid 80s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 20%.
Friday Night... Mostly clear with a slight chance of thunderstorms in the evening, then partly cloudy after midnight. Cooler with lows in the lower 50s. Chance of rain 20%.
Saturday... Partly sunny. Not as warm with highs in the upper 60s.
Saturday Night... Mostly cloudy. A chance of showers after midnight. Lows in the upper 40s. Chance of rain 40%.
Sunday... A slight chance of thunderstorms. Showers likely. Highs in the lower 60s. Chance of rain 70%.
Sunday Night... Showers likely with a chance of thunderstorms in the evening, then showers after midnight. Lows in the lower 50s. Chance of rain 90%.
Monday... Mostly cloudy with a chance of showers in the morning, then partly sunny with a slight chance of showers in the afternoon. Highs in the mid 60s. Chance of rain 50%.
Monday Night... Partly cloudy. Lows in the mid 40s. Highs in the mid 60s.
POP = Probability of Precipitation
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