Excessive Heat — St. Louis, Missouri

2025-08-16 to 2025-08-19 · St. Louis, Missouri

Event narrative

High temperatures in the upper 90s combined with high humidity to produce heat index values over 105 degrees for several days. The heat index peaked near 109 degrees. A total of 39 people were admitted to hospital emergency departments with heat related illness in St Louis County and city from August 16 through 19.

Wider weather episode

The hottest temperatures of the year were accompanied by high humidity, combining to produce several days of heat index values over 105 degrees.

Source: NOAA Storm Events Database, event_id 1281008. Narrative written by the NWS forecast office that issued the report.