Sioux Falls, South Dakota — A calm and gray start to the week across eastern South Dakota is expected to give way to a much more active weather pattern, as forecasters warn that strong winds approaching 40 to 50 mph could impact the Sioux Falls area by midweek. While temperatures will briefly trend milder, rapidly changing conditions could create travel concerns and a sharp return to colder air.
Residents waking up Monday morning found a quiet winter scene, with frost clinging to windshields and temperatures lingering in the low 20s. While no major hazards are expected early in the week, that calm is temporary as a stronger system approaches from the west.
Early week stays quiet but cool
Through Monday and much of Tuesday, weather conditions across Sioux Falls and surrounding communities remain relatively stable. Highs on Monday hover in the lower to mid-30s, with lingering slick spots possible on shaded roads, bridges, and rural routes following overnight refreezing.
By Tuesday, south winds begin to increase slightly, generally around 10 to 15 mph, allowing milder air to move northward. Afternoon temperatures are expected to climb into the upper 30s, offering a brief break from recent colder conditions. Travel impacts during this time are expected to be minimal.
Midweek system brings powerful winds
The most significant weather arrives Wednesday as a stronger disturbance moves into the northern Plains. According to the National Weather Service, pressure differences associated with the system will create strong and gusty winds, especially during the afternoon and evening hours.
Wind gusts could reach 40 mph, with isolated gusts potentially pushing higher in open areas north and west of Sioux Falls. High-profile vehicles traveling along Interstates 29 and 90 may experience difficult driving conditions, particularly during peak evening hours.
Temperatures on Wednesday are expected to reach the low 40s, but the increasing winds will make conditions feel cooler, especially late in the day.
Rain possible Wednesday night with falling temperatures
As the system strengthens Wednesday night, light rain becomes increasingly likely across southeastern South Dakota. While precipitation amounts are expected to remain modest, falling temperatures raise concerns for wet roads transitioning to icy surfaces overnight.
Forecasters caution that a brief flash-freeze scenario is possible late Wednesday night as temperatures drop quickly after precipitation begins. Untreated roads, overpasses, and rural highways could become slick with little warning, particularly outside the metro area.
While snow chances remain low, a brief rain-snow mix cannot be ruled out, especially as colder air filters in behind the system.
Read Also: Southwest Kansas Warms Up as Dodge City Nears 60 Degrees This Week
Thursday turns colder and blustery
Conditions shift noticeably on Thursday as winds swing to the northwest and colder air pours back into the region. Daytime highs are expected to fall into the mid-20s, while wind gusts may again approach 40 to 50 mph.
Although only a slight chance of light snow is expected early Thursday, blowing snow could briefly reduce visibility in rural areas if even minor accumulation occurs. Wind chills will dip into the teens, reinforcing a wintry feel across eastern South Dakota.
Residents are encouraged to secure loose outdoor items ahead of the strong winds and use caution if traveling during peak gusts.
Late-week improvement ahead
By Friday and Saturday, the pattern begins to relax. Sunshine returns, winds ease, and temperatures recover into the mid to upper 30s. While still seasonable for December, the calmer conditions will offer a welcome break following the midweek wind event.
Long-range models suggest a more active winter pattern may redevelop next week across the northern Plains, but confidence remains low on exact timing and impacts.
Five-day outlook for Sioux Falls
- Monday: Partly sunny, high near 34
- Tuesday: Partly sunny, high near 39
- Wednesday: Partly sunny, high near 41, windy
- Wednesday night: Rain likely, low near 21, strong winds
- Thursday: Mostly cloudy, slight snow chance, high near 25, windy
- Friday: Partly sunny, high near 37
What residents should watch for
While no major winter storm is expected, the combination of strong winds, temperature swings, and possible icing makes this a week to stay weather-aware. Travelers, especially those driving high-profile vehicles, should plan ahead for Wednesday night and Thursday.
Do you expect the winds to impact travel or outdoor plans in your area? Share what you’re seeing locally and how conditions are shaping up where you live in the comments.
