St. Louis is waking up to clear skies and plenty of sun this Tuesday morning, May 12, 2026, with temperatures starting near 52°F and climbing quickly into the 80s. Expect a bright, mostly sunny afternoon with a high near 84°F and a light southwest breeze. If you are planning to be outside, midday and early afternoon will be the warmest stretch of the day.
Afternoon Heat, Evening Shower Chance
Sun holds on through the afternoon, with highs topping out around 84°F and southwest winds around 3 to 12 mph. A cold front slips through tonight and brings a slight chance of showers and an isolated thunderstorm between about 9:00 p.m. and 1:00 a.m., with lows near 59°F. If your plans run late, it is worth having an indoor backup ready. For full timing and updates, see the National Weather Service St. Louis.
Wednesday Cooler And Gusty
Behind the front, Wednesday, May 13, 2026, turns a bit cooler but still sunny, with a high near 77°F. Northwest winds around 7 to 13 mph could gust up to 22 mph in spots, so it is a good idea to secure lightweight outdoor items like patio umbrellas and banners.
Weekend Warm-Up And Spotty Storms
Southerly flow returns late in the week and brings in warmer, more humid air, with highs in the upper 80s on Friday and near 90°F on Saturday, and a shot at 92°F on Sunday. Daily chances for scattered showers and thunderstorms are expected from Friday into next week, so timing will be hit-or-miss and worth checking before any big outdoor plans.
What To Know For Plans
This afternoon looks like one of the better windows for outdoor activities, but you will want a backup plan if anything stretches past 9:00 p.m. For real-time watches and city alerts, you can sign up for NotifySTL and follow preparedness guidance from the City of St. Louis Emergency Management Agency.
