Missouri – St. Louis starts Friday with crisp blue skies and a sharp winter chill, but the calm weather will be short-lived. Forecasters are tracking a weekend system expected to bring light rain Saturday night, followed by a potentially slippery rain–snow mix early Sunday that could disrupt travel across the metro.
Weekend system brings first signs of winter instability
A developing disturbance from the west will move into Missouri late Saturday, pulling moisture over the region as temperatures rise into the upper 30s. Light rain is expected to begin overnight, but the timing of colder air early Sunday will determine how quickly precipitation shifts to a rain–snow mix.
Meteorologists at the National Weather Service in St. Louis note that accumulations should stay minimal, generally a trace to one inch, but even small amounts can cause problems on I-70, I-64, I-55, and elevated surfaces. With temperatures hovering close to freezing at daybreak Sunday, untreated roads, overpasses, and shaded areas may become slick.
What drivers should expect on Sunday
Sunday morning will feature widespread low clouds, lingering moisture, and temperatures near 32°F. Light bursts of snow could briefly reduce visibility, especially when combined with gusts up to 15 mph. While significant travel disruptions are not anticipated, drivers should be prepared for slower speeds and spotty slick patches through late morning.
Authorities advise planning extra time for church travel, early commutes, or airport departures. Road conditions are expected to gradually improve by early afternoon as the system pulls east and drier air settles in.
Temperatures drop again to start the week
Behind the departing storm, colder air filters into St. Louis. Monday will turn clear but brisk, with highs only in the low 30s and wind chills running even colder. Sunshine returns Tuesday with a noticeable warm-up, pushing highs into the upper 40s before the next weak system approaches midweek.
Early signs of a stronger pattern change
Long-range forecast models suggest the second week of December may bring a surge of Arctic air into the central Midwest. This could open the door to additional snow chances as storm tracks become more active, a shift often seen during early winter transitions.
Meteorologists caution that extended outlooks remain fluid, but weather watchers across Missouri should keep an eye on updates as colder, more dynamic patterns evolve.
Five-day temperature and conditions outlook for St. Louis
| Day | High / Low | Forecast Summary |
|---|---|---|
| Friday | 41 / 35 | Sunny, cold morning, light winds |
| Saturday | 38 / 31 | Increasing clouds, late-night rain develops |
| Sunday | 38 / 15 | Rain–snow mix; slick travel possible |
| Monday | 32 / 24 | Mostly sunny, colder and dry |
| Tuesday | 48 / 38 | Mild, mostly sunny, quiet pattern |
Staying prepared
With fluctuating temperatures and mixed precipitation in the forecast, residents are encouraged to stay updated through local advisories and prepare for potentially slow travel on Sunday morning. Dressing in warm layers, clearing windshields thoroughly, and checking road conditions before leaving home can help ensure a safer start to the day.
If you’re in the St. Louis area, share your local weather observations or road conditions in the comments below.
