St. Louis weather Sunday brings mostly sunny skies and a pleasant high near 80°F—a perfect spring day before a significant weather system arrives Monday.
Let’s talk about your Sunday first. It’s going to be gorgeous. Grab your sunglasses and get outside, whether that’s Forest Park, the Arch grounds, or your favorite neighborhood spot. East winds at 6 to 10 mph will keep things comfortable, and there’s virtually no rain in the forecast (just 4% chance of precipitation). This is ideal weather for outdoor activities, tailgating, or even hitting the links—if you’ve been waiting for good golfing conditions, today’s your day. If you’re heading to Behemoth at The Pageant tonight, you’ll have perfect conditions for getting downtown.
But here’s where I need to get serious with you: Monday is going to be a rough day weatherwise, and we need to prepare now.
Starting Sunday night around 2 AM CT, a 30% chance of showers and thunderstorms moves in. Nothing severe expected then, but it’s the herald of what’s coming. By Monday morning, moisture will be streaming into the region ahead of a shortwave trough and surface low pushing northeast through the Midwest. The National Weather Service forecasters are particularly concerned about elevated convection early Monday morning across northeast Missouri closer to the upper trough.
But the main event is Monday afternoon and evening. There is significant potential for severe thunderstorms Monday, with large hail, damaging winds (gusts up to 35 mph), and even tornadoes possible. An 86% chance of precipitation means rain is almost certain. Temperatures will climb to 84°F before storms intensify, with south winds at 12 to 20 mph gusting hard.
Here’s what you need to do:
Monday morning, keep your phone charged and alerts on. Have an emergency first aid kit and a waterproof document bag ready in case you need to shelter quickly. If you’re attending any concerts or events—like Melissa Etheridge at The Factory or David Byrne at Stifel Theatre on Tuesday—monitor the forecast closely. You can Find tickets on StubHub or Get tickets on SeatGeek if you need to reschedule.
Allergy sufferers: pollen counts will spike Sunday before the rain clears things out. Stock up on allergy relief nasal spray and consider a pollen count face mask if you’re heading outdoors early in the day.
For tailgating or outdoor grilling this weekend, a portable propane grill is perfect for Sunday’s conditions—just make sure everything is secured and moved inside before Monday’s winds arrive.
If you’re planning a casual Sunday dinner, grilled chicken or fish pairs perfectly with this weather. Pair it with fresh vegetables and a light salad. Need ingredients? You can order groceries on Amazon and have everything for tonight’s dinner delivered to your door.
Looking ahead: After Monday’s storms clear out Tuesday, we’ll shift toward cooler weather for the rest of the week. This system marks the end of our warm stretch, so enjoy Sunday while you can.
