St. Louis is waking up to a hazy, hot Saturday, with highs climbing near 94°F under mostly sunny skies and heat index values pushing toward 102°F by afternoon — get your outdoor plans done early and treat the midday hours as indoor time.
Today’s Setup
West winds stay light at 5 to 10 mph, and the National Weather Service in St. Louis says a weak capping inversion should break along and south of I-70 late this morning, sparking isolated to scattered showers and thunderstorms after 1 PM. A cold front will push into northeast Missouri and west-central Illinois this evening, but forecasters note its timing is out of phase with peak heating, so any storms should be weakening by then. Overnight stays warm and sticky, with a low around 76°F and a lingering slight chance of storms before 3 AM.
Best Window To Be Outside
Morning is your window — think Forest Park before 10 AM for a run or a round at one of the city’s public courses while the heat index is still manageable. By early afternoon, MLCAPE values of 1,500 to 2,500 J/kg mean a stronger storm could bring gusty winds, though weak wind shear keeps confidence in severe weather too low for the Storm Prediction Center to message. Slow storm motion and precipitable water near 2 inches (above the 90th percentile for this time of year) could produce locally heavy downpours, so keep an eye on the sky if you’re near the Mississippi River waterfront.
Heat And Storm Risk
St. Louis sits in a Heat Advisory area, with heat index values up to 105°F possible through Tuesday. Stay hydrated, check on neighbors without air conditioning, and keep a NOAA weather radio handy in case storms strengthen this afternoon. A portable bluetooth speaker and shaded seating make a backyard sprinkler afternoon far more bearable than fighting the heat downtown.
Weekend Plans Around Town
Tonight, Jim Gaffigan brings his “Everything Is Wonderful!” show to River City Casino & Hotel, and El Monstero with Night Ranger plays an outdoor set at Hollywood Casino Amphitheater — both are solid options once the afternoon storm risk clears. Grab tickets on SeatGeek or Find tickets on StubHub before showtime. Sunday brings The Black Keys: PEACHES ‘N KREAM to The Factory, with a 40% chance of afternoon storms and a high near 91°F, so plan for possible weather delays. Looking ahead, the Cardinals host the Diamondbacks at Busch Stadium on July 23 — check out outdoor gear deals now and grab Official team gear on Fanatics ahead of first pitch.
Tonight’s Dinner
With temps in the 90s and grill weather locked in, fire up the grill for burgers, steaks, or grilled chicken with corn on the cob — an instant-read meat thermometer and grill brush and scraper set make cleanup and doneness a breeze. For low-effort char, this tri-tip smoking guide is worth a look. Need ingredients? You can order groceries on Amazon and have everything for tonight’s dinner delivered to your door.
Next Few Days
Sunday stays warm and humid with a high near 91°F and a 40% storm chance after 1 PM. The heat advisory pattern persists into early week, with daily storm chances continuing through Tuesday as the region stays parked in a hot, moist airmass.
