St. Louis, Missouri – Thunderstorms are set to roll into St. Louis on Tuesday afternoon, promising a dramatic shift from the calm summer morning. Commuters along I-70 and throughout the city should plan for slick roads and the potential for heavy downpours, especially after 1 p.m.
According to the National Weather Service, a 50 percent chance of showers and thunderstorms will develop after 1 p.m. Tuesday, with rain and lightning possibly causing delays across St. Louis and nearby areas. Motorists are urged to allow extra time for travel, reduce speeds, and avoid flooded streets. Keep your devices charged in case of brief power outages, and monitor weather alerts for updates on changing conditions.
Residents in Brooklyn, Florissant, and Granite City should also stay alert for sudden downpours that could impact local roadways and afternoon plans. Although rainfall totals are not expected to be extreme, isolated storms may bring heavy bursts of rain. Wednesday brings a break, with mostly sunny skies and a high near 95°F, but the threat of storms returns by Thursday and lingers into the weekend.
Prepare for unsettled summer weather as the week continues. Secure outdoor items and check your emergency supplies. More showers and thunderstorms are possible each afternoon through Sunday, keeping the region on alert for pop-up storms.
Warnings remain in effect as the pattern stays active, and more advisories could follow if conditions worsen.
Five-Day St. Louis, MO Weather Outlook (July 15–20):
- Tuesday: Showers and thunderstorms likely after 1 p.m., high near 89°F.
- Wednesday: Mostly sunny, 20% chance of storms after 1 p.m., high near 95°F.
- Thursday: 30% chance of afternoon storms, mostly sunny, high near 95°F.
- Friday: 30% chance of storms, mainly after 1 p.m., partly sunny, high near 91°F.
- Saturday/Sunday: 20% chance of storms both days, mostly sunny, highs in the low to mid-90s.
