ST. LOUIS, MO–IL – Streetlights flicker against a gray, misty dawn as drizzle dampens roads across the Mississippi River Valley. This early Monday morning, St. Louis and the Metro East wake to fog, slick pavement, and a steady breeze — the first round of a soggy start to the week. The unsettled pattern won’t last forever, but drivers should expect slower commutes and limited visibility through late morning.
According to the National Weather Service in St. Louis, showers will taper briefly Monday before another round builds Tuesday morning. Clouds will thicken again as a moisture-rich system sweeps in from the Plains, spreading rain across both Missouri and Illinois. Rainfall may become steady through the day, with totals between a quarter and half an inch possible by Tuesday night.
Travelers along I-70 and I-64 should prepare for wet conditions and ponding in low-lying areas during Tuesday’s commute. Winds remain light but shift east to southeast ahead of the cold front. Temperatures hover near 61°F Tuesday before dropping sharply midweek.
By Wednesday, the system slides east, leaving behind cooler air and drier skies. Highs fall into the low 50s under a mix of clouds and sun. Thursday looks brighter and calmer, with sunshine and lighter winds — perfect timing for late-week errands or early Halloween decorating.
Friday and Saturday stay dry and mild, ideal for Trick-or-Treat plans Friday night across the metro. Still, cooler air is lurking to the northwest, hinting at a chilly November ahead once the weekend fades.
Five-Day Outlook for St. Louis, MO–IL:
Mon: 60/50 – Cloudy; drizzle and fog early.
Tue: 61/48 – Showers; periods of steady rain.
Wed: 54/42 – Breezy; clearing late.
Thu: 57/41 – Mostly sunny; crisp air.
Fri: 60/41 – Dry; mild Halloween setup.
