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Weather St. Louis, MO

St. Louis Weather Saturday: Sunny 78°F—Perfect for Outdoor Events

Best Window Saturday: 78°F, 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

Sat 78°Sunny
Sun 78°Mostly Sunny
Mon 84°Showers And ...
Tue 73°Sunny then C...
Wed 69°Slight Chanc...
Thu 70°Sunny then S...
Fri 64°Chance Rain ...

St. Louis weather Saturday is shaping up beautifully—sunny skies, a high near 78°F, and light northeast winds at 3 to 7 mph make this one of the nicest days we’ve had in a while.

This is your golden ticket to get outside. Whether you’re heading to Busch Stadium for the Cardinals game next Friday, catching the St. Louis City SC vs. San Jose Earthquakes match at Energizer Park this evening, or simply enjoying Forest Park, today’s conditions are ideal. The overnight low will drop to a crisp 54°F with mostly clear skies, so if you’re planning any evening activities downtown or along the riverfront near the Gateway Arch, bring a light jacket.

Sunday stays pleasant too—mostly sunny with a high near 78°F and a 7% chance of rain. However, our local National Weather Service forecasters are already eyeing a significant weather shift. An upper-level trough crossing the Rockies will spark surface cyclogenesis Sunday evening, bringing the potential for severe thunderstorms to western Missouri late Sunday night into Monday morning. As these storms push eastward into our area Monday morning, they’re expected to weaken initially—but here’s the kicker: a much more dangerous round of severe weather is forecast for Monday afternoon and evening. All hazards are on the table, including large hail, damaging winds, and isolated tornadoes. If you’re attending any outdoor events Monday, keep your phone charged and stay weather-aware.

For today and tomorrow, though, seize the moment. This is prime grilling weather—if you’ve been eyeing a portable propane grill for your patio or tailgate setup, this weekend is the time to fire it up. Allergy sufferers should note that pollen counts remain elevated for late April, so consider grabbing an allergy relief nasal spray or pollen count face mask if you’re spending extended time outside.

Concert fans, Iron & Wine takes the stage at The Pageant on Monday night—find tickets on SeatGeek or StubHub to catch this intimate performance before the storms roll in. If you’re planning a casual Saturday dinner at home, a simple grilled pasta with fresh vegetables pairs perfectly with this mild, pleasant weather. You can order groceries on Amazon and have everything delivered, or pick up fresh ingredients for a quick stir-fry.

Look ahead: Monday brings severe weather risk, followed by cooler air and a cold front Monday night. Plan your outdoor activities for today and Sunday—after that, we’ll be battening down the hatches.

Live Radar — St. Louis Area

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Live weather radar for St. Louis, MO

Radar data from the National Weather Service