Excessive Heat in St. Louis, Missouri
Excessive Heat August 16, 2025 – August 19, 2025 · St. Louis, Missouri
What the National Weather Service wrote
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.
The wider storm
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 1281008. Narratives are written by the National Weather Service forecast office that issued the report.
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