SIOUX FALLS SiouxFallsWeather.com

Thursday, September 17, 2026

Zone Forecast Product

.REST OF TODAY...Patchy fog late this morning. Partly sunny. Highs in the mid 70s. Northeast winds 5 to 10 mph. .TONIGHT...Showers with a chance of thunderstorms after midnight. Locally heavy rainfall possible after midnight. Lows around 60. East winds around 10 mph with gusts up to 20 mph, increasing to 15 to 20 mph with gusts up to 30 mph after midnight. Chance of rain near 100 percent. .FRIDAY...Mostly cloudy. Showers with a chance of thunderstorms in the morning, then a chance of showers in the afternoon. Humid with highs in the upper 70s. East winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 90 percent. .FRIDAY NIGHT...Mostly cloudy. A chance of showers in the evening. Humid with lows in the upper 50s. Northeast winds 5 to 10 mph. Chance of rain 40 percent. .SATURDAY...Mostly cloudy. A slight chance of showers in the afternoon. Highs in the upper 60s. North winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20 percent. .SATURDAY NIGHT...Mostly cloudy. Lows in the mid 50s. .SUNDAY...Mostly cloudy. A chance of showers in the afternoon. Highs in the lower 60s. Chance of rain 40 percent. .SUNDAY NIGHT...Mostly cloudy. A chance of showers in the evening, then showers likely after midnight. Lows in the lower 50s. Chance of rain 70 percent. .MONDAY...Mostly cloudy. A chance of showers in the morning. Highs in the lower 60s. Chance of rain 50 percent. .MONDAY NIGHT...Mostly cloudy. Lows in the upper 40s. .TUESDAY...Mostly cloudy in the morning, then becoming partly sunny. Highs in the mid 60s. .TUESDAY NIGHT...Partly cloudy. Lows in the lower 50s. .WEDNESDAY...Partly sunny. A chance of showers in the morning. Highs in the lower 70s. Chance of rain 30 percent. -- This email has been checked for viruses by AVG antivirus software. www.avg.com