St. Louis wakes up muggy and mild near 73°F this morning, building to a sunny, hot afternoon near 91°F with a heat index as high as 102 — get outdoor chores and errands done before midday, because there’s no rain in the forecast to cool things off.
Today’s Setup
The National Weather Service in St. Louis says a decaying cluster of overnight storms is sliding across southern Missouri and weakening in dry air aloft, so no showers or thunderstorms are expected here today. A cold front out of southern Iowa is stalling across central Missouri, and moisture pooling along it is pushing dewpoints into the 70s. Combined with highs in the low 90s, that’s enough to send the heat index to 100°F or higher, especially south of the I-70 corridor.
Best Window To Be Outside
Morning is your best window before the mugginess builds. Forest Park walkers and Gateway Arch grounds visitors should aim to wrap up by late morning, and golfers at the city’s public courses will want an early tee time — light west wind around 3 mph and sunny skies make for good golf weather before the afternoon heat sets in.
Heat Risk Through Midweek
Today’s heat index near 102 is just the start. The NWS says hot, humid conditions continue through the weekend and into the middle of next week, with heat index readings of 100 to 108 beginning Sunday — when the high climbs to 94°F — and persisting through Wednesday. That heat finally breaks Thursday, giving way to several rounds of showers and thunderstorms into Friday. Limit strenuous outdoor activity to early morning or evening, and check on neighbors without air conditioning.
What To Wear Or Bring
Light colors and sun protection are the move today and tomorrow. A UPF 50+ Sun Hoodie for $5 is a smart grab if you’re fishing the Mississippi River or spending hours outside in this stretch of heat.
Cardinals, Concerts, and Weekend Plans
The St. Louis Cardinals host the Colorado Rockies today at Busch Stadium for Cardinals Polo day — with the heat index near 102, tailgaters should lean on shade, water, and a portable propane grill for pregame food, plus official team gear on Fanatics or tickets on SeatGeek if you still need seats. Tonight, Young the Giant plays Saint Louis Music Park on the Victory Garden Tour with Cold War Kids — grab tickets on StubHub before heading out into the evening warmth. Looking ahead, Train brings the Drops of Jupiter anniversary tour to Hollywood Casino Amphitheater Tuesday, August 11 — a Train t-shirt makes a fun pickup for the show.
Tonight’s Dinner
With sunny, dry conditions and no rain to chase you inside, it’s a great night to fire up the grill for burgers, steaks, or grilled chicken with corn on the cob. An instant-read meat thermometer keeps everything safe in this heat, and a grill brush and scraper set makes cleanup quick. Need ingredients? You can order groceries on Amazon and have everything for tonight’s dinner delivered to your door.
Next Few Days
Sunday brings the hottest stretch yet, with a high near 94°F and heat index up to 105 as an upper-level low parked over James Bay steers disturbances toward the Great Lakes; St. Louis stays dry while Iowa sees the bulk of any storm activity. Expect the hot, humid pattern to hold through Wednesday before the heat finally breaks Thursday with showers and thunderstorms lingering into Friday. For more on gearing up for the heat, check out outdoor gear deals around the area.
