St. Louis started Saturday on the sticky side, waking up to muggy, mostly clear skies and temperatures in the low 70s. By this afternoon, the heat is expected to crank up with a high near 90. Partly sunny skies will give way to a slight chance of showers and isolated thunderstorms after about 3 p.m., with southwest winds around 5 to 8 mph. In other words, keep those afternoon barbecues flexible.
Afternoon Storm Chance
Forecasters are calling for a slight chance of showers and thunderstorms to develop mainly after 3 p.m., with that high near 90 and continued southwest winds at 5 to 8 mph. Coverage should taper off after sunset, but a shortwave is expected to lift into the region Sunday, which will ramp up shower and thunderstorm coverage Sunday night into Monday. The greatest odds for widespread rain come overnight, and the heaviest bands could drop locally heavy rainfall and trigger brief flooding in poor-drainage spots, especially late Sunday night and Monday, according to the National Weather Service St. Louis.
How To Prepare
Got outdoor plans? Build in a quick shelter option in case those afternoon storms flare up and be ready for brief delays at events today and through the weekend. If temperatures spike again by midweek, consider heading to a public cooling center or calling 2-1-1 for local options. The City of St. Louis keeps an updated list of cooling center sites and hours. Pack plenty of water, and try to limit strenuous activity between 11 a.m. and 6 p.m. on Tuesday, June 9, 2026 and Wednesday, June 10, 2026, while keeping an eye out for any heat-related advisories.
Quick Commute Notes
Breezy southwest winds stay on the lighter side today, so travel should be mostly smooth, but a compact umbrella will not be the worst thing to toss in your bag. Pop-up storms could still catch evening commuters and anyone heading to late-day events. Check conditions before heading out tonight and keep an eye on long-range forecasts through Thursday, June 11, 2026 if you have outdoor plans lined up next week.
