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Union County State Park, SD 7-Day Night Weather Forecast
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Union County State Park, SD Weather Forecast
Union County State Park, SD Weather Forecast Date: 549 AM CDT Sun Aug 23 2026
The area/counties/county of: Union, including the cities of: North Sioux City, Beresford, Elk Point, Alcester, and Jefferson.or toggle through each period.
Today... Mostly cloudy. Highs in the upper 70s. Southeast winds 5 to 10 mph, becoming southwest this afternoon.
Tonight... Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy with showers likely with a chance of thunderstorms after midnight. Humid with lows in the lower 60s. South winds 5 to 10 mph. Chance of rain 70%.
Monday... Mostly cloudy with a chance of showers and thunderstorms in the morning, then partly sunny in the afternoon. Humid with highs in the upper 70s. South winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 50%.
Monday Night... Mostly cloudy. A slight chance of showers after midnight. Humid with lows in the lower 60s. Southeast winds 5 to 10 mph. Chance of rain 20%.
Tuesday... Partly sunny. Humid with highs in the lower 80s. Southwest winds 5 to 10 mph.
Tuesday Night... Partly cloudy in the evening, then clearing. Lows in the lower 60s.
Wednesday... Sunny. Highs in the lower 80s.
Wednesday Night... Clear. Lows in the upper 50s.
Thursday... Sunny. Highs around 80.
Thursday Night... Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 50s.
Friday... Partly sunny. Highs in the upper 70s.
Friday Night... Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Lows in the lower 60s. Chance of rain 50%.
POP = Probability of Precipitation
Union County State Park Radar Loop
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