St. Louis Weather Alert: Mild Midweek Gives Way to Rain and a Cooler Turn

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Missouri steps into the day under thinning clouds and an almost springlike feel, a sharp contrast to what January usually delivers. Sidewalks dry out, jackets feel optional, and the air carries a mild softness that hints at change.

Warm conditions hold across eastern Missouri through midweek, with highs reaching the upper 50s to near 70 in parts of the St. Louis region today before settling into the 50s and 60s Wednesday. According to the National Weather Service in St. Louis, this stretch of mild weather ends as a rain system approaches late in the workweek.

Rain becomes the main concern Thursday. Widespread showers are expected, with an 80 to 90 percent chance of rain across the metro area. Roads may turn slick during peak travel times, and reduced visibility is possible in heavier bursts. Plan extra time if you’ll be driving, especially during the afternoon and evening hours.

Behind the rain, cooler air pushes in. Friday stays unsettled with lingering showers, though coverage drops off compared to Thursday. Temperatures slide back into the upper 40s and 50s, signaling a return toward seasonal January conditions.

By Saturday, winter makes another appearance. Highs fall into the upper 30s and 40s, and a 20 percent chance of rain or snow showers develops. Even brief precipitation could create slushy spots or localized slick roads, especially during the morning.

For now, enjoy the warmth, but keep rain gear ready and stay alert as conditions change quickly late this week. Another cool-down may shape how the first full week of 2026 ends across Missouri.