St. Louis

St. Louis Weekly Weather, Sunny Start with Prospects of Showers and Thunderstorms

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Published on September 20, 2025
St. Louis Weekly Weather, Sunny Start with Prospects of Showers and ThunderstormsSource: Google Street View

For all you St. Louis locals and visitors looking to plan your week, the weather forecast calls for a mixed bag of sun, clouds, and potential thunderstorms. Kicking off today, there's a subtle hint of change in the air, with a 20 percent chance of showers and thunderstorms cropping up after 3pm. But worry not, it promises to be mostly sunny with a high near 88 degrees and some mild south winds coming your way in the afternoon, according to the National Weather Service in St. Louis, MO.

The narrative shifts tonight when the likelihood of showers and thunderstorms rises to 50 percent, predominantly after midnight. Heads up for overcast skies and a low resting around 68 degrees. This pattern of precipitation continues relentlessly through to next Friday, with the chance of thunderstorms hovering each day – you can expect them to roll in mainly after 4pm on Sunday and similarly post-1pm in the subsequent days. If you're stepping out, keep those umbrellas within reach and stay cozy with nighttime temps hovering around the mid-60s.

In a statement obtained by the National Weather Service, the detailed forecast indicates showers likely and a possible thunderstorm before 1pm on Monday, then more showers and thunderstorms post-1pm. The probability of precipitation is a consistent 60 percent, so it seems like a good time to catch up on indoor activities or explore the city's wealth of museums and galleries.

As we venture into midweek, the script remains the same with mostly cloudy days, highs reaching 77 degrees, and a persistent 60 percent chance of the wet stuff from Tuesday through to Wednesday. Nights will follow suit with frequent weather disturbances and lows in the sixties. It isn't until Thursday that you'll get a slight break from the storms with a partial retreat to mostly sunny skies and a high near 74 degrees.

Meanwhile, the Hazardous Weather Outlook for the region extends a heads-up to residents across eastern and central Missouri as well as west central and southwest Illinois. While spotter activation isn't anticipated at this time, staying tuned to weather updates is advisable for those residing in or trekking through these areas.