SIOUX FALLS SiouxFallsWeather.com

Friday, September 18, 2026

Zone Forecast Product

.TODAY...Patchy fog this morning. Showers with a chance of thunderstorms this morning, then a chance of showers with a slight chance of thunderstorms this afternoon. Highs in the lower 70s. Southeast winds 15 to 20 mph with gusts up to 30 mph. Chance of rain near 100 percent. .TONIGHT...Cloudy with a 20 percent chance of showers. Humid with lows in the upper 50s. Northeast winds 5 to 10 mph. .SATURDAY...Cloudy. A slight chance of showers in the afternoon. Highs in the mid 60s. Northeast winds 10 to 15 mph. Chance of rain 20 percent. .SATURDAY NIGHT...Cloudy. Lows in the mid 50s. Northeast winds around 10 mph with gusts up to 20 mph. .SUNDAY...Cloudy with a 20 percent chance of showers. Highs in the mid 60s. Northeast winds 10 to 15 mph with gusts up to 25 mph. .SUNDAY NIGHT...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 upper 50s. Chance of rain 50 percent. .MONDAY NIGHT...Mostly cloudy. Lows in the upper 40s. .TUESDAY...Mostly cloudy in the morning, then becoming mostly sunny. Highs in the lower 60s. .TUESDAY NIGHT...Partly cloudy. Lows in the mid 40s. .WEDNESDAY...Partly sunny. Highs in the mid 60s. .WEDNESDAY NIGHT...Mostly cloudy in the evening, then partly cloudy with a chance of showers after midnight. Lows in the lower 50s. Chance of rain 30 percent. .THURSDAY...Mostly cloudy in the morning, then becoming mostly sunny. Highs in the upper 60s. -- This email has been checked for viruses by AVG antivirus software. www.avg.com