| NWS Forecast for: Union County Issued by: National Weather Service Sioux Falls, SD Last Update: 1238 PM CDT Tue Jun 9 2026 |  |
This Afternoon: Mostly sunny and breezy, hot with highs in the mid 90s. South winds 15 to 25 mph. Heat index values up to 104. Tonight: Mostly cloudy with a chance of showers and thunderstorms. Breezy with lows in the lower 70s. South winds 15 to 25 mph with gusts up to 35 mph. Chance of rain 50 percent. Heat index values up to 101 early in the evening. Wednesday: Sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 90s. Southwest winds 15 to 20 mph, becoming west in the afternoon. Chance of rain 20 percent. Wednesday Night: Mostly clear in the evening, then mostly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Cooler. Less humid with lows in the lower 60s. Northwest winds 15 to 20 mph with gusts up to 30 mph, becoming northeast 5 to 10 mph after midnight. Chance of rain 50 percent. Thursday: Partly sunny with a slight chance of showers and thunderstorms in the morning, then sunny in the afternoon. Breezy and not as warm with highs in the lower 80s. North winds 15 to 20 mph, becoming northwest 20 to 25 mph in the afternoon. Chance of rain 20 percent. Thursday Night: Mostly clear and breezy. Lows in the upper 50s. Friday: Sunny. Highs in the upper 80s. Friday Night: Mostly clear. Lows around 60. Saturday: Mostly sunny. A chance of showers in the afternoon. Highs in the mid 80s. Chance of rain 30 percent. Saturday Night: Partly cloudy. Lows in the mid 50s. Sunday: Partly sunny. Highs in the mid 70s. Sunday Night: Partly cloudy. Lows in the lower 50s. Monday: Mostly sunny. Highs in the upper 70s. | |
| Zone Forecast: Union County | |
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