By 5:35 a.m. on Saturday, July 11, the St. Louis metro was waking up to muggy, mostly cloudy skies and temperatures hovering around 72°F, with a flash-flood watch already in effect through 7 p.m. Much of the region will spend the day dodging scattered storms that could deliver brief, intense downpours and quick rises on creeks and low-lying streets.
According to NWS St. Louis, showers and thunderstorms are most likely from late morning into the mid-to-late afternoon, with the greatest storm coverage expected roughly between noon and 5 p.m. Any stronger storm cells could dump rain at rates of 1–2 inches per hour on already saturated ground, which pushes the risk of localized flash flooding higher. Forecasters also note that an isolated severe storm is possible over parts of southeast Missouri and southwest Illinois, with damaging winds as the main concern.
Afternoon Timing And Commute
Storms are expected to tangle with both the midday and afternoon commute on Saturday, July 11, so it is a good day to build in extra travel time. Heavy downpours will cut visibility and lead to ponding in low spots; drivers should slow down and avoid trying to push through standing water. Transit riders should check current service alerts before heading out at Metro Transit.
Where Storms Could Be Strongest
For most of the St. Louis metro, the main story will be heavy rain rather than a full-on severe weather event. Still, any thunderstorm that repeatedly tracks over the same area could trigger fast, localized flooding. The highest risk for severe weather centers on damaging wind in far southeast Missouri and southwest Illinois, though brief gusts and a few downed branches are possible anywhere a stronger storm pops up. Keep wireless alerts turned on this afternoon and be ready to head indoors quickly if a warning is issued for your neighborhood.
What To Expect This Week
Conditions are expected to settle down on Sunday, with sunshine returning and a high near 86°F. A warmer, mostly dry stretch should take over into midweek, with afternoon highs climbing into the upper 80s to low 90s by Wednesday and Thursday. Rain chances look limited to spotty showers, aside from a slight uptick on Tuesday across southeast Missouri and southwest Illinois. It is worth keeping an eye on updated forecasts before locking in outdoor plans later in the week.
Quick Safety Reminders
Never drive through flooded roadways, and move to higher ground if water starts to rise around you. Secure loose outdoor items that could be tossed around by gusty winds. For the latest watches, warnings, and any forecast changes, check updates from the NWS St. Louis office as well as your local emergency management agency.
