St. Louis weather today (Thursday, June 25) brings a warm, muggy high near 87°F — but the bigger story is what’s coming after dark: a Flash Flood Watch is in effect, and the National Weather Service warns of widespread, potentially heavy thunderstorms tonight through Friday morning. Get your outdoor time in early; the window is shrinking fast.
Today’s Setup
The morning looks workable. A slight chance of showers before 8 AM CT should fade, leaving partly sunny skies and a light west wind around 3 mph through midday. That’s your best shot to walk Forest Park, mow the yard, or run any errand that needs dry conditions. Storm chances climb to about 40% by afternoon, then surge to 90% overnight as a shortwave system from the west fires up a low-level jet across Missouri, igniting heavy storms along a stalled front.
Flash Flood Risk — Take This Seriously
The Weather Prediction Center has issued a Moderate Risk of Excessive Rainfall over portions of Missouri today. NWS forecasters in St. Louis are flagging nearly 2 inches of precipitable water in the atmosphere and conditions ripe for “training storms” — repeated rounds of convection crossing the same area — a classic setup for dangerous flash flooding. If you live or work near low-lying areas along the Mississippi riverfront, Gravois Creek, or the River des Peres corridor, move vehicles to higher ground before dark.
With power outages possible during strong storms, it’s smart to have a backup power source ready. The DARAN 288Wh Power Station is just $90 for Prime members — solid timing for storm season.
Cardinals at Busch Stadium Tonight
The St. Louis Cardinals host the Arizona Diamondbacks tonight at Busch Stadium. Early innings should be playable, but storm chances build through the evening — keep the MLB app handy for any delay alerts. Heading out? Pack a compact travel umbrella and throw on your St. Louis Cardinals jersey. Still need seats? Get tickets on SeatGeek before first pitch.
What To Wear and Pack
A packable rain jacket is the essential item today — light enough to tuck in any bag but ready when the sky opens up. Tonight’s low holds around a warm 70°F, so this is about staying dry, not warm. Leave the heavy layers at home.
Rainy Day Dinner: Slow Cook Something Hearty
Storms rolling in after dark are basically an invitation to stay in and eat well. A big batch of chili or beef stew in a programmable slow cooker practically makes itself while you wait out the weather. Prefer stovetop? An enameled cast iron Dutch oven handles any hearty one-pot recipe beautifully. Need ingredients? You can order groceries on Amazon and have everything for tonight’s dinner delivered to your door.
Next Few Days
Friday stays wet with storm chances at 80% and more heavy rainfall possible — push any outdoor plans to Saturday, when conditions improve. Then brace for a major shift: the National Weather Service warns of potentially dangerous heat and humidity building into St. Louis starting Sunday and continuing through next week. That heat event is worth watching closely.
The Cardinals continue their homestand with the Miami Marlins series starting June 27 at Busch Stadium — check our Cardinals-Marlins gameday weather guide for updated conditions before you head out. Also this weekend, the Louis Tomlinson How Did We Get Here? World Tour stops at Chaifetz Arena on Saturday, June 27 — an indoor show, so the storms are a non-issue. Find tickets on StubHub and grab a Louis Tomlinson t-shirt before you go.
