St. Louis woke up Sunday, July 12, to clear skies, thick humidity and temperatures hovering around 72°F, with those classic sticky dew points locals know too well. Expect a mostly sunny day with a high near 87°F and a light north breeze around 5 to 9 mph. Tonight stays mostly clear with a low near 69°F. The headline for the week, though, is a steady warm-up that brings 90-degree heat back by midweek.
Morning Fog, Then Sunshine
Early risers in low-lying river valleys may run into some patchy fog before mid-morning, but it should lift quickly once the sun gets to work. Most neighborhoods will see rapid clearing and plenty of sun through the afternoon. Winds remain light and variable, so any visibility issues are expected to be short-lived and confined to just a few river valley spots. The region looks to stay mostly dry with only limited chances for showers through Tuesday, according to the National Weather Service St. Louis.
Heat Builds Through The Week
Temperatures climb step by step. Highs reach close to 88°F on Monday, slide into the low 90s by Tuesday, then push into the low to mid 90s by Thursday and Friday. Overnight lows stay on the muggy side, generally in the upper 60s to mid 70s, which cuts down on any real nighttime relief. If you are planning yard work, workouts or outdoor events later in the week, aim for mornings or evenings and keep the water bottle close.
Where To Cool Off
For anyone who needs a break from the heat, the city keeps a list of cooling sites that open during hot spells, including libraries, recreation centers and other community spots. Residents can dial 2-1-1 to find nearby options and hours. Before heading out, check the City’s list of locations and schedules here: Cooling Sites in the St. Louis Area.
Bottom line, Sunday brings a sunny and mostly dry setup with a comfortable morning commute, followed by a gradual but steady build in heat as the week goes on. Keep an eye on updated forecasts, and do a quick check on neighbors, pets and anyone who might be more vulnerable when temperatures climb.
