St. Louis started Saturday, May 9, 2026, shrouded in thick, slow-moving fog, with temperatures stuck in the mid‑50s and visibility knocked down in pockets across the metro. A Dense Fog Advisory is in effect this morning through 8 AM CDT, and most of the patchy fog is expected to lift by late morning. Once it does, the day flips the script to a warm, mostly sunny afternoon, with highs near 82°F. Morning drivers should plan on taking it slow, especially on bridges and river crossings, until conditions improve.
Fog and Morning Commute
Visibility could drop to about a quarter mile or less in spots around the St. Louis area, which can turn familiar roads and busy interchanges into tricky stretches. “If driving, slow down, use your headlights, and leave plenty of distance ahead of you,” the National Weather Service advises. Be sure to check the office’s hazard page for the exact advisory area and any updates before you hit the road.
Afternoon Warm-Up And Late-Night Spotty Storms
Once the fog burns off, expect partial to full sunshine and a fairly quick warm-up, with west winds around 3–10 mph and a high near 82°F this afternoon. A cold front will slip in late Saturday, bringing the chance for isolated showers or even a rumble of thunder late Saturday night into early Sunday (roughly 10 PM Saturday to 2 AM Sunday), though coverage should stay spotty and mainly north of I‑70. If you have evening plans, it is not a bad idea to keep a lightweight rain jacket close, as Sunday will feel noticeably cooler behind the front.
Weekend Outlook
On the backside of the front, temperatures drop off: Sunday, May 10, turns cooler with highs near 69°F and lows around 47°F Sunday night. Monday, May 11, then rebounds into the low 70s under mostly sunny skies. Another front may move through late Tuesday with a chance of showers Tuesday night and some uncertainty around mid‑week temperatures, so it is worth double-checking the forecast if you have outdoor events planned. For now, most outdoor plans for Saturday afternoon look good once the morning fog clears out.
