Brisk Winds and Morning Fog: St. Louis Braces for a Gusty Friday Transition

Morning: Dense Fog and a Chilly Start

St. Louis residents woke up to a complex weather pattern this Friday morning, February 20, 2026. The National Weather Service (NWS) issued an early alert for dense fog developing across portions of south-central Illinois and expanding westward into the St. Louis metropolitan area. Commuters were advised to exercise extreme caution as visibility dropped significantly before dawn. As the sun begins to break through, temperatures are hovering in the mid-30s, around 31°F to 33°F, though a steady west wind is already making it feel much colder. Wind chills have been reported in the low 20s, necessitating heavy coats for those heading out early.

Afternoon: Sunshine Meets High Wind Gusts

By the afternoon, the fog is expected to clear completely, giving way to mostly sunny skies. While the day features a modest February warmup with highs climbing to approximately 43°F to 45°F, the primary weather story will be the wind. High-pressure shifts are driving powerful west winds with steady speeds near 10 mph and gusts reaching up to 37 mph. These gusts may rattle street signs and make outdoor activities challenging. Despite the sunshine, the brisk air will maintain a sharp edge throughout the day, so layers are highly recommended for anyone spending time outdoors.

Evening: Increasing Clouds and Late-Night Snow Potential

As we head into the evening hours, the clear skies will begin to fade. Cloud cover is expected to increase significantly after sunset as a weak system moves into the region. Temperatures will drop steadily toward a low of 28°F. Local meteorologists are monitoring a slight chance of light snow developing toward daybreak on Saturday. While any resulting accumulation is expected to be minimal, even a brief dusting or light flurry could create slick spots on roads and sidewalks as temperatures dip below the freezing mark overnight. Humidity levels are expected to sit around 44% to 53% during this transition.

Travel and Safety Outlook

Road conditions on major routes such as I-64, I-44, and I-70 were reported as mostly dry earlier today, but the combination of morning fog and afternoon wind gusts requires attentive driving. High-profile vehicles should be particularly mindful of the 37 mph gusts on east-west corridors. For the remainder of the day, residents should secure loose outdoor items that could be displaced by the wind. Looking ahead, the weekend remains bright but cooler, with a more significant warmup projected to arrive by the middle of next week.