St. Louis, MO – A stretch of warm fall sunshine will carry Missouri and southwest Illinois into the weekend, but early next week brings a change. Drivers and residents should prepare for possible thunderstorms beginning Monday, with chances lingering through Wednesday.
According to the National Weather Service in St. Louis, southeast Missouri and southwest Illinois could see scattered storms Monday afternoon into Tuesday, with the highest impact near major roadways including I-70 and I-55. While no widespread severe weather is expected yet, forecasters caution that lightning and brief downpours could slow commutes and affect outdoor events.
Until then, skies stay mostly clear. Highs climb into the upper 80s Thursday through Sunday, an unusual stretch of warmth for the first week of October. Conditions remain favorable for outdoor plans, including Halloween decorating and early fall festivals, though afternoon heat may feel more like late summer.
Saturday looks to be the standout day for the region, with highs near 88 and abundant sunshine. Sunday mirrors the same pattern, though humidity may build slightly ahead of the approaching storm system. Anyone planning road trips, yard work, or tailgating this weekend can expect dry conditions through Sunday evening.
Looking ahead, temperatures cool into the mid-70s by Wednesday, marking a noticeable shift to more typical October weather. Spotter activation is not expected at this time, but updates will follow if storm risks increase.
Five-Day Forecast for St. Louis, MO
- Thursday: Mostly sunny, high 88°F, light south winds.
- Friday: Sunny, high 88°F.
- Saturday: Sunny, high 88°F, calm conditions.
- Sunday: Sunny, high 88°F, slight humidity.
- Monday: 20% chance of afternoon storms, high 86°F.
