St. Louis residents could see a refreshing shift in the weather as cooler September air moves in during Labor Day. The holiday starts partly sunny, giving families and travelers a comfortable break from recent warmth. But by Tuesday, showers may develop and impact drivers along I-70 and I-44. Anyone planning outdoor events should prepare a backup plan.
According to the National Weather Service in St. Louis, Monday will stay calm and partly sunny, with highs near 79. Conditions shift Tuesday when a 20% chance of afternoon showers develops. By Wednesday, the rain risk climbs, bringing a stronger chance of scattered showers across the metro and surrounding counties. Highs will rise into the mid-80s before cooling again by Thursday.
Travelers on I-70, I-44, and I-55 should remain alert for slick conditions during midweek commutes. Light winds and spotty rain may not shut down travel but could make roads slippery during heavier bursts. If you plan to grill or host outdoor gatherings on Labor Day, expect fair skies but keep tents or shelters handy for late-week plans.
The week ends drier, with sunny skies and highs near 81 by Friday. This sets up a pleasant start to the first full weekend of September.
Five-Day Forecast for St. Louis, Missouri
- Labor Day (Monday): Partly sunny, high near 79.
- Tuesday: 20% chance of showers after 1 p.m., high near 79.
- Wednesday: 20% chance of showers, high near 85.
- Thursday: Sunny, high near 72.
- Friday: Sunny, high near 81.
