St. Louis woke up to clear skies Monday morning, July 13, 2026, with a comfortable start in the upper 60s to low 70s. Skies stay sunny through the day, and the afternoon high should top out near 88°F as light northeast breezes keep things pleasant early on, even as humidity starts sneaking back in later in the week.
Today and This Afternoon
Sunshine will rule the day with little chance of rain. Temperatures are expected to climb into the mid-80s by late morning and reach the upper 80s by mid-afternoon. Northeast winds around 3-8 mph mean the evening commute will be warm but not dangerously hot, so outdoor plans after work are in play as long as you stay hydrated.
Midweek Heat Risk
After Tuesday, the heat ramps up fast, with highs near 91°F on Tuesday, in the low to mid-90s on Wednesday and Thursday, and into the mid-90s by Friday and Saturday. Forecasters say heat index readings could approach 100-105°F between Thursday and Saturday, raising the risk of heat-related illness for older adults, young children, and people working outside, according to the National Weather Service.
Stay Cool and Where To Go
Most neighborhoods should stay dry through this stretch, but if the heat turns dangerous, the city maintains a network of cooling centers and resources across St. Louis. Residents can call 2-1-1 to confirm hours and openings. For a current list of locations and schedules, check the City of St. Louis cooling centers page, and try to schedule any strenuous outdoor activity for early morning or later in the evening.
