SIOUX FALLS SiouxFallsWeather.com

Monday, August 17, 2026

Zone Forecast Product

.TONIGHT...Mostly cloudy. A slight chance of showers and thunderstorms this evening, then a chance of showers and thunderstorms after midnight. Lows in the lower 60s. South winds 10 to 15 mph, becoming southwest around 5 mph after midnight. Chance of rain 50 percent. .TUESDAY...Mostly sunny. A chance of showers and thunderstorms in the morning. Humid with highs around 80. Northwest winds around 5 mph. Chance of rain 40 percent. .TUESDAY NIGHT...Partly cloudy. Lows in the upper 50s. North winds around 5 mph, becoming east around 5 mph after midnight. .WEDNESDAY...Partly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the upper 70s. Southeast winds around 5 mph, becoming southwest around 5 mph in the afternoon. Chance of rain 50 percent. .WEDNESDAY NIGHT...Partly cloudy. Lows in the upper 50s. South winds around 5 mph. .THURSDAY...Mostly sunny. Highs in the lower 80s. .THURSDAY NIGHT...Mostly clear. A chance of showers and thunderstorms in the evening. Lows in the lower 60s. Chance of rain 30 percent. .FRIDAY...Partly sunny in the morning, then clearing. Highs in the lower 80s. .FRIDAY NIGHT...Mostly clear. Lows in the upper 50s. .SATURDAY...Mostly sunny. Highs in the upper 70s. .SATURDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 50s. .SUNDAY...Mostly cloudy in the morning, then becoming partly sunny. Highs in the upper 70s. .SUNDAY NIGHT...Partly cloudy. Lows around 60. .MONDAY...Mostly cloudy in the morning, then becoming mostly sunny. Highs around 80. -- This email has been checked for viruses by AVG antivirus software. www.avg.com