St. Louis wakes up on Saturday, April 18, to light rain, a cool 50°F, and the tail end of overnight thunderstorms as they finally start to calm down. Showers and a few lingering storms are expected to wind down through the morning, with most of the metro drying out and warming to a sunny afternoon high near 58°F.
Morning Showers Clear Out by Lunchtime
Scattered showers will slide off to the southeast through mid- to late-morning, leaving most neighborhoods dry around midday. According to the National Weather Service, there is about a 40% chance of showers on Saturday, with northwest winds of 13–16 mph and gusts up to 24 mph during the afternoon. Morning drivers should plan on slick roads and give themselves extra time, especially on bridges and overpasses where surfaces can stay wet and slick a bit longer.
Blustery Afternoon, Quiet and Cool Night
As the atmosphere mixes out later in the morning and into the afternoon, gusts are expected to jump into the 20–25 mph range, enough to shove around unsecured patio furniture and make walks in exposed spots feel pretty blustery. Skies clear out in the evening and temperatures slide down to around 43°F Saturday night, with some of the usual cooler outlying areas possibly dipping into the 30s. Winds relax overnight, which helps set the stage for a sunnier Sunday.
Patchy Frost a Low-End Threat
With many locations slipping into the 30s late tonight, there is a low chance of patchy frost Sunday morning, mainly on exposed or elevated plants and objects. Forecast discussion notes that warm soils and recent rainfall should keep frost from becoming widespread, but gardeners with tender plants may want to take simple precautions such as moving potted plants indoors. A light cover over vulnerable vegetation is an easy bit of insurance.
Sunday Shines, Then the Heat Cranks Up
Sunday looks like the standout of the weekend, with sunshine and a high near 69°F. Monday stays pleasant too, with highs in the upper 60s. After that, a fast warm-up moves in: the metro may see lows of 80°F by Tuesday and mid-80s by Thursday, before another chance of showers and thunderstorms arrives late next week. If you are plotting outdoor plans, Sunday is your best bet for reliable sun.
Bottom line: expect a damp and breezy start to Saturday, a dry and comfortable Sunday, and a sharp warm-up as next week unfolds. Keep an eye on official updates from the National Weather Service for any late changes, and give sensitive plants a little protection tonight.
