St. Louis woke up Saturday, June 13, 2026, to muggy, mostly cloudy skies and temperatures lingering in the upper 60s. A few scattered showers could pop up through late morning, but the bigger story comes later. The city will heat into the mid-to-upper 80s on a light south breeze, and the real action is expected tonight as a cold front barrels through.
According to the National Weather Service, several rounds of thunderstorms are possible today, with the highest risk for organized severe storms lining up along the cold front late Saturday night into early Sunday. Forecasters say damaging straight-line winds are the main concern, with quarter-size hail and an isolated tornado possible in any embedded supercell. Heavy downpours could trigger localized flooding. For more on how the setup evolved from a calm start to a volatile finish, see the earlier breakdown of the wild weekend storm threat.
Evening Severe Threat
Storms are expected to ramp up this evening and carry through the overnight hours of Saturday, June 13, into early Sunday, June 14. The most likely window for organized severe weather runs roughly from 11 p.m. Saturday to 3 a.m. Sunday. Initial storms may fire farther northwest over parts of Iowa and northwest Missouri before organizing into clusters and bowing segments that push southeast. Any of those clusters could deliver damaging winds and brief, heavy downpours. If you have outdoor plans after sunset, consider moving them earlier or make sure you have an indoor fallback.
Sunday Cooler And Windy
Once the front clears, Sunday, June 14, looks noticeably cooler and breezy, with highs near 77°F and northwest winds around 13 mph, gusting up to about 20 to 21 mph. Skies should turn mostly sunny. Monday is expected to be milder and mainly dry before warmer, more humid air returns and brings another chance of showers and storms later in the week. If you are scheduling outdoor events into next week, it is worth keeping an eye on how the timing of those rain chances develops.
What To Know For Your Plans
Secure loose outdoor items, avoid driving through standing water, and keep your phone charged in case warnings are issued. Transit riders should check Metro Transit weather updates for any service changes, and everyone should refresh the National Weather Service forecast if conditions start to shift. If severe thunderstorm or flash-flood warnings are issued, move indoors, stay away from windows, and follow local emergency guidance.
