St. Louis woke up to a muggy start Wednesday, July 8, 2026. Around 5:40 a.m. CDT, it was mostly clear and roughly 72°F after some overnight patchy fog. Temperatures are headed into the low 90s by afternoon, with only a slight chance of a few isolated showers later in the day.
Afternoon Heat
The local National Weather Service notes a sticky, humid morning with readings near 72°F. The forecast calls for a high near 91°F on Wednesday, with the heat building on Thursday toward 95°F and heat-index values up to 101°F, which can put real strain on outdoor activity. If you are planning to be outside for a while, take sensible precautions, keep water and shade handy, and pace yourself, according to the National Weather Service.
Spotty Showers This Afternoon
Patchy fog should thin by mid-morning, giving way to mostly sunny skies and a slight (about 20%) chance of a shower or brief thunderstorm this afternoon. Winds will be light, so any downpours that pop up are expected to be brief and highly localized. Most commutes should stay dry, but tossing a small umbrella in the bag is not a bad idea if you have evening plans.
Stronger Storms Thursday Through The Weekend
Thunderstorm coverage increases from Thursday into Saturday, and some storms Thursday and Friday could become severe with damaging winds and hail. Storms Thursday night may also produce heavy, training downpours that could trigger localized flooding. Keep an eye on later forecasts and be ready to head indoors quickly if lightning or severe-wind warnings are issued, with timing looking most uncertain in the late afternoon and evening hours, per the National Weather Service.
Plan Ahead
With heat and storm threats overlapping through the week, it is smart to plan outdoor events for the morning when it is coolest, keep a charged phone handy for weather alerts, and avoid standing water after heavy rain. The City maintains a list of cooling sites and summer resources if you or someone you know needs an air-conditioned refuge, so check local listings for hours and availability at the St. Louis cooling centers.
