SIOUX FALLS SiouxFallsWeather.com

Thursday, May 21, 2026

Zone Forecast Product

.TONIGHT...Mostly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the upper 40s. Southeast winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 50 percent. .FRIDAY...Showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Breezy with highs in the lower 60s. Southeast winds 15 to 25 mph with gusts up to 35 mph. Chance of rain near 100 percent. .FRIDAY NIGHT...Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the evening. Lows in the mid 40s. Southwest winds 10 to 15 mph with gusts up to 25 mph, becoming west 5 to 10 mph after midnight. Chance of rain 50 percent. .SATURDAY...Partly sunny. Highs around 70. West winds 5 to 10 mph. .SATURDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the upper 40s. South winds 5 to 10 mph. .SUNDAY...Sunny, warmer with highs around 80. .SUNDAY NIGHT...Mostly clear. Lows in the mid 50s. .MEMORIAL DAY...Sunny. Highs in the mid 80s. .MONDAY NIGHT...Mostly clear. Lows in the upper 50s. .TUESDAY...Sunny. Highs in the mid 80s. .TUESDAY NIGHT...Partly cloudy. Lows in the upper 50s. .WEDNESDAY...Mostly sunny. Highs in the mid 80s. .WEDNESDAY NIGHT...Mostly cloudy with a chance of showers and thunderstorms. Lows in the upper 50s. Chance of rain 30 percent. .THURSDAY...Partly sunny. A chance of showers in the afternoon. Highs in the lower 80s. Chance of rain 30 percent.