St. Louis/ Weather & Environment

St. Louis Basks in One Sunny Day Before Soaking Storms Roll In

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Published on September 28, 2026
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St. Louis starts Monday with mostly cloudy skies and temperatures around 61 degrees, but the clouds should give way to a sunnier afternoon. The high is expected to reach 77 degrees, offering one of the calmer outdoor days before a warmer and wetter stretch takes over later this week.

Sunny Monday Brings A Brief Break

Monday afternoon should be sunny with a light northeast breeze around 5 mph and no rain in the forecast. Skies will stay clear Monday night, when temperatures fall to about 54 degrees, according to the National Weather Service in St. Louis.

Temperatures Climb Into The 80s

The warm-up begins Tuesday, with sunny skies and a high near 82 degrees. Wednesday could feel more like midsummer, reaching about 88 degrees under mostly sunny skies, with south winds between 5 and 13 mph.

Rain And Thunderstorms Arrive Late Wednesday

Rain may begin late Wednesday night before becoming more widespread Thursday, when showers and thunderstorms are likely and the chance of precipitation reaches 70%. The weather service says 1 to 3 inches of rain could fall across the broader area from late Wednesday night through Friday, with locally heavy rain potentially causing flooding in places that are prone to it.

Cooler, Showery Weekend Follows

Friday looks cooler, with a high near 72 degrees and a 50% chance of showers and thunderstorms. Saturday and Sunday should remain milder, with highs around 72 and 73 degrees, respectively, but both days carry a chance of rain showers; no watches, warnings or advisories are currently listed.