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Westerville, SD Weather Forecast
Westerville, SD Weather Forecast Date: 644 AM CDT Sun Sep 13 2026
The area/counties/county of: Clay, including the city of Vermillion.or toggle through each period.
Today... Mostly cloudy with a chance of showers this morning, then partly sunny this afternoon. Highs around 70. East winds 5 to 10 mph. Chance of rain 40%.
Tonight... Mostly cloudy. A chance of showers and thunderstorms after midnight. Lows in the mid 50s. Southeast winds around 10 mph with gusts up to 20 mph, increasing to 15 to 20 mph with gusts up to 30 mph after midnight. Chance of rain 40%.
Monday... A chance of thunderstorms. Showers, breezy and more humid with highs in the upper 70s. Southeast winds 15 to 25 mph with gusts up to 35 mph. Chance of rain 80%.
Monday Night... Mostly cloudy. A slight chance of showers and thunderstorms in the evening. Lows in the mid 50s. Southwest winds 5 to 10 mph with gusts up to 20 mph, becoming northwest after midnight. Chance of rain 20%.
Tuesday... Mostly sunny. Less humid with highs around 70. North winds 10 to 15 mph.
Tuesday Night... Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 50s.
Wednesday... Mostly cloudy with a 50% chance of showers. Highs in the mid 60s.
Wednesday Night... Mostly cloudy. A chance of showers after midnight. Lows in the mid 50s. Chance of rain 50%.
Thursday... Mostly cloudy. A chance of showers in the morning. Highs in the lower 70s. Chance of rain 50%.
Thursday Night... Mostly cloudy. A chance of showers in the evening, then showers likely with a chance of thunderstorms after midnight. Lows in the mid 50s. Chance of rain 60%.
Friday... Mostly cloudy with a chance of showers in the morning, then mostly sunny in the afternoon. Highs in the lower 70s. Chance of rain 50%.
Friday Night... Partly cloudy. A chance of showers after midnight. Lows in the lower 50s. Chance of rain 30%.
POP = Probability of Precipitation
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