St. Louis rolled into Tuesday under clear skies and a mild 57°F, but the quiet start is not expected to last. Temperatures should climb into the upper 60s to around 70°F before clouds and humidity thicken later in the day. Showers and thunderstorms are possible late this afternoon, with the best chance for storms overnight. A few storms, mainly across southeast Missouri and southern Illinois, could turn strong to severe late today into this evening.
Afternoon Into Evening
The National Weather Service reports that rain chances ramp up through the afternoon, with the primary storm window from late afternoon into the evening and showers likely lingering overnight. Forecasters place the highest risk for severe weather roughly between 2 and 8 p.m. across the southeastern portion of the area. Any organized storms could bring damaging wind gusts and hail up to about quarter size, though tornadoes are not currently expected.
Commute And Outdoor Plans
Drivers should be ready for slick pavement and pockets of reduced visibility when heavier downpours roll through. Stronger cells could briefly knock down small branches and trigger isolated power outages. Before heading out, check schedules and service alerts, as Metro Transit may adjust service during rough weather. If you have evening plans, tack on extra travel time, bring rain gear, and steer clear of flooded streets. Keep your phone charged and stay tuned to local warnings, especially if you will be out during the 2–8 p.m. window.
Midweek Outlook
Once the main band of storms shifts east, Wednesday is expected to turn drier and slightly cooler, with highs near 65°F and a brisk northwest breeze. The rest of the workweek looks seasonable and mostly dry, with highs holding in the mid 60s through Friday before a warmer pattern settles in late in the weekend. Overnight lows should dip into the mid 40s Wednesday night, and only low, lingering chances for showers are in the forecast through Friday.
