Excessive Heat — Madison, Illinois

2025-08-15 to 2025-08-18 · Madison, Illinois

Event narrative

The combination of temperatures in the upper 90s and high humidity led to heat index values over 105 degrees for several days. The heat index peaked around 110 degrees.

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 1281013. Narrative written by the NWS forecast office that issued the report.