NWS WEATHER
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St. Louis, MO skyline — local weather forecast and conditions
St. Louis, MO Photo: Dwayne Pounds
Weather St. Louis, MO

St. Louis Weather Wednesday: Sunny, Low-Humidity 84°F Before Weekend Storms

Best Window Wednesday: 84°F, Mostly Sunny
Rain Risk Elevated
What To Wear / Bring Rain layer, water-resistant shoes, and a backup indoor plan
Useful Links Local forecast, radar, and relevant planning links
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7-Day Forecast

Wed 84°Mostly Sunny
Thu 82°Mostly Sunny
Fri 80°Chance Rain ...
Sat 90°Chance Showe...
Sun 97°Sunny
Mon 98°Mostly Sunny
Tue 94°Mostly Sunny

St. Louis is enjoying a mostly sunny Wednesday with a high near 84°F and refreshingly low humidity — a great day to get outside around Forest Park or the Gateway Arch grounds before rain chances build back in this weekend.

Today’s Setup

According to the National Weather Service in St. Louis, northerly winds are already advecting cooler, drier air into the region this morning, with a surface high sliding from the Upper Midwest toward the Great Lakes. Expect a north wind around 5 to 8 mph, mostly sunny skies, and only a 4% chance of a stray shower. Overnight lows drop to near 65°F under partly cloudy skies.

Best Window To Be Outside

Thursday looks just as pleasant — high near 82°F, mostly sunny, light east wind around 6 mph, and 0% rain chance — making Wednesday afternoon and all of Thursday the pick of the week for yard work, mowing, fishing along the Mississippi River, or a round of golf. Bring a golf divot repair tool if you’re heading to the course while the fairways are still soft from recent moisture.

Rain, Wind, Fire, Or Heat Risk

The dry stretch doesn’t last. NWS forecasters say showers and thunderstorm chances increase late Thursday night into Saturday as an upper-level storm system swings through, with the low-level jet focused over the area Friday morning pushing rain chances to 40-70%. Precipitable water values near 2 inches have forecasters flagging Missouri counties in a slight risk for excessive rainfall Friday, so isolated flash flooding is possible. If you’re headed to Hollywood Casino Amphitheater Friday for Bryan Adams or 5 Seconds of Summer, or Saturday for The Black Crowes and Whiskey Myers, keep radar handy since that’s an outdoor venue.

What To Wear Or Bring

Light layers work fine today and tomorrow — low humidity means it won’t feel oppressive even at 84°F. Pack a battery backup phone charger if you’re out all day at the ballpark or a show, and toss a poncho in the bag once Friday’s rain risk arrives.

Cardinals, Concerts & Tailgating

The St. Louis Cardinals host the Arizona Diamondbacks Thursday, July 23 at Busch Stadium, and Thursday’s forecast — sunny, 82°F, light east breeze — is about as good as tailgating weather gets. Grab a St. Louis Cardinals jersey or St. Louis Cardinals fitted cap before first pitch, and Find tickets on StubHub or Get tickets on SeatGeek if you still need seats. Tonight, The Head And The Heart play The Factory and Hilary Duff performs at Hollywood Casino Amphitheater — both should see comfortable, dry conditions. Looking ahead, Forrest Frank brings the Jesus Generation Tour to Enterprise Center Saturday; grab a Forrest Frank t-shirt to celebrate.

Tonight’s Dinner Idea

With dry air and a warm evening ahead, tonight is perfect grilling weather — burgers, steaks, or grilled chicken with corn on the cob all work well on the grate. An instant-read meat thermometer takes the guesswork out of doneness, and a grill brush and scraper set keeps grates clean for the next cookout. Need ingredients? You can order groceries on Amazon and have everything for tonight’s dinner delivered to your door — Amazon Fresh groceries makes it easy to skip the store run.

If you’re floating the river this week, the 2-Person Intex Floating Lounge with Cooler is a solid grab, and for tonight’s cookout, check out this tri-tip grilling guide for a low-and-slow alternative to burgers.

Next Few Days

Dry, comfortable weather holds through Thursday, then showers and storms build in late Thursday night through Saturday as the upper-level system moves across Missouri and Illinois — timing is still firming up, so check back as forecasters narrow the window.

Upcoming Home Games

Plan around the forecast — grab tickets, gear up, and see kickoff conditions.

St. Louis Cardinals vs Arizona Diamondbacks
Thu, Jul 23 · Busch Stadium
Read the gameday forecast →
St. Louis Cardinals vs Cincinnati Reds
Sat, Jul 25 · Busch Stadium
Read the gameday forecast →
St. Louis Cardinals vs Cincinnati Reds
Sat, Jul 25 · Busch Stadium
Read the gameday forecast →

Live Radar — St. Louis Area

Full interactive radar →
Live weather radar for St. Louis, MO

Radar data from the National Weather Service