St. Louis Area Sees Relief From Heat Wave as Cooler Temperatures Arrive
Overnight storms have moved out of the St. Louis area, bringing an end to the recent heat wave. Today, expect cooler temperatures in the mid-80s with lower humidity. More rain and storms are forecasted to return Tuesday night through Wednesday.

St. Louis, MO, August 17, 2026 —
The St. Louis area is experiencing a noticeable shift in weather patterns as overnight storms have cleared the region, signaling the end of a prolonged heat wave. Residents can anticipate a reprieve from the high temperatures and oppressive humidity that have dominated recent days.
Today’s forecast calls for significantly cooler conditions, with expected highs in the mid-80s. The accompanying decrease in humidity is anticipated to offer a more comfortable environment for outdoor activities and daily life across the metropolitan area.
However, this period of milder weather is expected to be temporary. Meteorologists are predicting the return of rain and storms, with forecasts indicating a high probability of unsettled weather beginning Tuesday night and continuing through Wednesday.
The recent heat wave had placed a strain on the region, prompting advisories and concerns for public health and energy consumption. The arrival of cooler air and the recent storms mark a significant change in the weather narrative for St. Louis.
Further details on the intensity and duration of the forecasted storms for Tuesday night and Wednesday will be provided as the weather system develops.
Story summarized from the original created by Matt Chambers on www.firstalert4.com, see more information here.