St. Louis, Mo. – A stretch of summerlike heat across Missouri will give way to unsettled skies this weekend as thunderstorms move into the St. Louis area starting Friday evening. Drivers and outdoor events could face disruptions as the storm chances build through Sunday night.
According to the National Weather Service in St. Louis, the first round of storms may develop late Friday afternoon with a 30% chance of rain, followed by more widespread activity Saturday evening. By Sunday, the threat of thunderstorms increases, with rain and lightning expected during the afternoon and evening hours.
Daytime highs will remain in the mid-80s across the metro, but humidity will rise, pushing heat indices into the upper 90s at times. Officials warn that lightning and brief heavy downpours could cause delays on major interstates including I-70, I-64, and I-55. Residents are urged to move indoors quickly if storms approach and to avoid flooded roadways.
Storm chances continue into Monday, with a 50 to 60% likelihood of showers across the metro. Conditions may improve slightly by midweek, but scattered rain remains possible.
Five Day Forecast for St. Louis, Mo.
- Friday: High near 89, storms possible after 1 p.m.
- Saturday: High 88, partly sunny, scattered storms late.
- Sunday: High 85, widespread showers and storms possible.
- Monday: High 83, 50–60% chance of showers and thunderstorms.
- Tuesday: High 82, scattered storms linger into midweek.
