Sioux Falls, South Dakota – A brewing summer system is set to disrupt Sioux Falls by early Friday afternoon, bringing scattered storms, gusty winds, and slick roads along I-29 and I-90. South Dakota residents should prepare for potential travel delays and brief downpours beginning after 1 p.m. on Friday, July 18.
According to the National Weather Service, a slight chance of showers will turn into thunderstorms Friday afternoon as a warm, humid air mass moves into the region. Highs will reach near 79°F, with south-southeast winds gusting up to 20 mph. Friday night brings a 40% chance of continued storms with temperatures dropping to 66°F.
Weekend Outlook: Saturday stays partly sunny with highs around 81°F and a calm breeze. Another round of storms is possible early Saturday night after 1 a.m. Sunday looks drier, partly sunny with highs near 82°F.
Looking Ahead: Monday heats up with highs climbing to 88°F. A 30% chance of showers returns Sunday night and lingers into early Tuesday. By Tuesday, highs may reach a sweltering 93°F — the hottest stretch of the week.
Residents should keep devices charged and avoid unnecessary travel during storm windows, especially late Friday. Stay weather-aware through the weekend, as isolated lightning and heavy rain could quickly develop.
📅 Sioux Falls 5-Day Forecast: July 18–July 23
- Friday: Slight chance of storms after 1 p.m., high 79°F
- Saturday: Partly sunny, high 81°F; chance of storms late
- Sunday: Partly sunny, high 82°F
- Monday: Partly sunny, high 88°F
- Tuesday: Mostly sunny, hot — high 93°F
- Wednesday: Mostly sunny, high 89°F
