Missouri–Illinois Weather This Week: Warm Midweek, Rain Chances Return by Friday

Sunshine and 70s linger through Thursday before a weak front brings light rain and cooler air for Veterans Day weekend.

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Jefferson City, MO – Soft clouds drift over the Mississippi River this morning, casting silver light across downtown St. Louis and the Arch. The region begins the new week under steady high pressure, delivering a rare stretch of calm, comfortable November weather before changes arrive late in the week.

Through Thursday, the Missouri–Illinois border region stays dry and mild, with highs in the upper 60s to low 70s. Breezes from the south will remain light, though gusts may reach 20 mph midweek. Skies turn mostly sunny Wednesday, creating a window of ideal weather for outdoor work, leaf cleanup, or early travel ahead of the weekend.

By Thursday night, a weak cold front slides into eastern Missouri and southern Illinois, increasing clouds and bringing the first chance of rain since the start of the month. Showers should stay scattered and light, but a few areas along I-70 and Route 3 may see slick roads Friday morning.

Behind the front, temperatures cool noticeably, dipping into the 40s by Sunday with highs near 50°F. Winds turn northwest, ushering in a crisp, late-fall feel just in time for early Veterans Day parades and outdoor events.

Looking ahead, long-range models hint at another, stronger system around mid-November — potentially bringing the first signs of winter weather north of St. Louis. For now, the region enjoys two more days of mild sunshine before late-week rain taps the brakes on fall’s warm streak.