Missouri drivers start the day moving through a gray blur as dense fog settles across the St. Louis metro. Tail lights fade quickly ahead, and visibility drops without warning on area roadways.
According to the National Weather Service, a Dense Fog Advisory remains in effect through mid-morning, with visibility falling below one mile in parts of eastern and central Missouri. The greatest impacts stretch across St. Louis, St. Charles, Jefferson, Franklin, and surrounding counties.
Travel is most hazardous on I-64, I-70, I-55, and I-44, where sudden slowdowns are likely. Bridges and river-adjacent corridors may see the thickest fog. Drivers should reduce speed, use headlights, and leave extra following distance.
As the morning progresses, fog gradually lifts. Milder air takes over through the afternoon, pushing temperatures into the lower 60s. Roads improve, offering a short break for holiday errands and regional travel.
Attention then turns to Sunday. Clouds thicken, and rain develops by afternoon, continuing into the evening. Gusty winds arrive late, creating difficult driving for high-profile vehicles on exposed highways.
Behind the rain, colder air surges in quickly. By late Sunday night, temperatures tumble toward the lower 20s, and wet pavement may refreeze. This raises a black ice concern for early Monday travel, especially on untreated roads and overpasses.
Monday stays brisk but quieter, with sunshine returning. Highs struggle to reach the upper 20s, signaling a clear shift into a winter pattern as the final days of the year approach.
Looking ahead to New Year’s Eve and the start of 2026, conditions remain cold but calmer, supporting safer travel windows if roads stay dry.
Plan extra time this morning, and stay alert for changing conditions through Sunday night. Traveling today? Share what visibility looks like where you are.
Five-Day Outlook: St. Louis, MO
- Today: Dense fog early, then mostly cloudy; high near 63
- Sunday: Rain developing, windy late; high near 73
- Monday: Colder, breezy, clearing; high near 27
- Tuesday: Sunny, cold; high near 36
- Wednesday (New Year’s Eve): Partly sunny, cold; high near 42
