| NWS Forecast for: Lyon County Issued by: National Weather Service Sioux Falls, SD Last Update: 614 AM CDT Sat Jul 25 2026 |  |
Today: Mostly sunny. Much warmer with highs in the upper 90s. Southwest winds 10 to 15 mph with gusts up to 30 mph, becoming north around 5 mph this afternoon. Tonight: Mostly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Humid with lows in the mid 70s. Southeast winds 5 to 10 mph, becoming southwest 10 to 15 mph after midnight. Chance of rain 30 percent. Heat index values up to 104 early in the evening. Sunday: Partly sunny. A chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 30 percent. Heat index values up to 102. Sunday Night: Mostly clear. A chance of showers and thunderstorms in the evening. Humid with lows in the lower 70s. South winds 10 to 15 mph, becoming southwest after midnight. Chance of rain 30 percent. Heat index values up to 101 early in the evening. Monday: Sunny. Highs in the mid 90s. North winds 10 to 15 mph. Monday Night: Mostly clear in the evening, then partly cloudy with a chance of sprinkles after midnight. Lows around 70. Tuesday: Mostly sunny. Highs in the lower 90s. Tuesday Night: Mostly clear. Lows in the upper 60s. Wednesday: Mostly sunny. Highs in the lower 90s. Wednesday Night: Mostly clear in the evening, then becoming partly cloudy. A chance of showers after midnight. Lows in the upper 60s. Chance of rain 30 percent. Thursday: Mostly sunny with a chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 30 percent. Thursday Night: Mostly clear in the evening, then becoming partly cloudy. A chance of thunderstorms in the evening. A chance of showers. Lows in the upper 60s. Chance of rain 40 percent. Friday: Sunny. Highs in the upper 80s. | |
| Zone Forecast: Lyon County | |
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