Sioux Falls drivers could wake up to dense fog and reduced visibility Saturday morning, with travel impacts likely on I-29 and I-90. The patchy fog risk diminishes later in the morning, but residents should prepare for changing conditions throughout the day.
According to the National Weather Service in Sioux Falls, isolated thunderstorms will develop Sunday evening and return again Monday night, September 22. These storms could bring heavy downpours, lightning, and brief gusty winds across eastern South Dakota, southwest Minnesota, northwest Iowa, and northeast Nebraska. While severe weather risk remains low, localized travel hazards are possible during the evening commute.
Saturday stays mostly cloudy with highs near 71. Sunday will be warmer, reaching 78, with a 20 percent chance of afternoon showers. Thunderstorm activity increases Sunday night into Monday, with rain chances peaking at 30 percent. By Tuesday, skies clear and temperatures settle into the mid-70s, offering a stretch of calmer weather midweek.
Motorists should allow extra travel time Sunday night and Monday, especially along I-29, Highway 14, and rural county roads where visibility may suddenly drop. Residents are encouraged to secure outdoor items ahead of gusts, charge devices, and stay alert to weather updates.
The unsettled pattern eases after Monday night, with partly to mostly sunny skies expected through Friday. Cooler nights in the mid-50s bring a fall-like feel across eastern South Dakota.
Five Day Forecast for Sioux Falls, South Dakota
- Saturday: Patchy fog early, mostly cloudy, high 71, low 55
- Sunday: Partly sunny, chance of afternoon showers, high 78, low 56
- Monday: Mostly sunny, 30% chance of evening storms, high 80, low 56
- Tuesday: Partly sunny, high 75, low 55
- Wednesday: Mostly sunny, high 75, low 55
