St. Louis is getting a genuine cool-down on Thursday, June 18, with afternoon highs near 79°F — about 10 to 15 degrees below Wednesday’s heat — though a slight chance of showers and thunderstorms moves in after noon CT. The morning is your window: get outside early.
Today’s Setup
A front that swept through overnight is pulling in a drier, cooler airmass, with northwest winds at 3 to 8 mph through the day. Skies start partly sunny and comfortable. The National Weather Service expects isolated to scattered showers and a possible rumble of thunder mainly after noon, focused near the I-70 corridor, where precipitation chances reach 20 to 40 percent. Coverage will be limited — many spots may see nothing at all. No severe weather is expected; the Storm Prediction Center has no outlook for the St. Louis area today.
Best Window To Be Outside
Morning is golden. A round at Forest Park Golf Course, a walk along the Arch grounds, or a fishing trip to the confluence of the Missouri and Mississippi rivers would all be comfortable before noon. If you’re heading to Tower Grove Park or the riverfront this afternoon, pull up radar around 12 PM CT and keep a light jacket handy. Tonight clears out beautifully — low around 61°F, nearly calm winds, partly cloudy skies. Open those windows, St. Louis.
Heading out to the water this morning? The Plano Double-Sided Tackle Box is just $14 right now — worth tossing in the car.
Weekend Weather and Events
Friday (Juneteenth, June 19) is the best day of the stretch — mostly sunny, high near 85°F, nearly calm winds. Watch for patchy fog in river valleys before 7 AM CT, especially along the Mississippi lowlands.
Friday night at Hollywood Casino Amphitheater: the MGK: Lost Americana Tour plays under what should be clear, pleasant skies cooling into the upper 60s — a great outdoor concert night. Grab a mgk t-shirt and Find tickets on StubHub. Ben Folds also performs at The Factory on June 19.
Saturday, June 20 warms to near 87°F with only a 10% rain chance for the daytime hours — mostly fine. Santana & The Doobie Brothers — Oneness Tour 2026 roll into Hollywood Casino Amphitheater that evening. A Santana hat is a solid accessory for an outdoor summer show. Get tickets on SeatGeek while seats last. The St. Louis Open Black Rodeo also runs at Chaifetz Arena Saturday night.
Sunday carries the highest storm risk of the weekend. The National Weather Service flags opportunities for showers and thunderstorms through early Monday, with a low threat of locally heavy rainfall. Outdoor plans that day warrant a close radar watch.
Looking ahead: the St. Louis Cardinals host the Arizona Diamondbacks at Busch Stadium on June 22. Grab Official team gear on Fanatics and check back closer to game time for an updated forecast.
Tonight’s Dinner
Cool evening, possible afternoon shower rolling through — this is prime programmable slow cooker weather. A pot of chili or beef stew practically makes itself while you stay dry indoors. Or go rustic with an enameled cast iron Dutch oven for a thick, hearty soup. Need ingredients? You can order groceries on Amazon and have everything for tonight’s dinner delivered to your door.
Next Few Days
- Friday (Juneteenth): Mostly sunny, near 85°F. Best day of the stretch.
- Saturday: Warm at 87°F, 10% storm chance — mainly fine through the day.
- Sunday: Highest chance of showers and thunderstorms; possible locally heavy rain.
- Early next week: Temperatures remain near to below average.
Browse outdoor gear deals for weekend prep essentials, and check back for daily St. Louis updates.
