National Weather Service United States Department of Commerce

Severe Weather and Heavy Rain from the Great Lakes to the Mid-Atlantic; Heat Persists in the East

Widespread strong thunderstorms with damaging winds and locally heavy rain are expected from the Upper Ohio Valley into the southern Mid-Atlantic today and portions of the central Appalachians and Carolinas on Saturday. Monsoonal moisture will bring a flash flooding threat to the Desert Southwest. Sweltering heat persists from the Plains to the southern Mid-Atlantic through tonight. Read More >

So far this month, the high temperature in St. Louis has been 100, 100, and 99. That heat will remain in place through at least the first week of this month, and it looks like this will be one of the warmest starts to September on record.
An Extreme Heat Warning is now in effect for the entire region through Saturday. Afternoon heat index values will top out around 105 degrees. Please take precautions!
The heat and humidity continue through Saturday. We get a bit of a break Sunday into Monday, but it looks like the heat will return for the middle of next week.