St. Louis woke up Sunday, May 3, to clear skies and a brisk 45°F, the kind of cool start that quickly gives way to a warm-up under full sunshine. The region will heat up fast, making for a bright, breezy afternoon before the weather flips later tonight.
Afternoon highs should land near 76°F with southwest winds around 6–14 mph and gusts reaching up to 25 mph. It will feel warm but a bit blustery at times, so keep the sunscreen close if you are planning to be outside.
Evening Storm Risk
A cold front will slide through Sunday night, bringing a chance of showers and thunderstorms between 7 p.m. and 11 p.m. on Sunday, May 3. Storms become more likely between 11 p.m. Sunday and 2 a.m. Monday, May 4. Most storms are expected to be brief, and confidence in a widespread severe outbreak is low, but a few isolated storms could still produce hail up to 1 inch or a damaging wind gust. Forecasters spell out the timing and uncertainty in the NWS St. Louis forecast discussion.
Monday Into Midweek
Monday, May 4, turns warmer with a high near 81°F and only a slight chance of afternoon showers as the front slows and allows richer moisture to return to the region. The better bet for widespread rain and rounds of thunderstorms arrives Monday night into Tuesday, May 5, when highs drop into the upper 60s and rain chances hang on through Tuesday night.
What This Means For Plans
Today looks like a solid window for outdoor plans through the afternoon, but it is wise to shift evening events indoors. Any outside activity after 7 p.m. should have a clear backup plan. Drivers late Sunday night should be ready for sudden heavy downpours and reduced visibility; if you see lightning, head inside and steer clear of flooded roads.
If you have travel or evening plans, keep an eye on updates and check forecasts before heading out for the latest timing and any localized advisories.
