Excessive Heat — Southern Cook County, Illinois

2025-06-21 · Southern Cook County, Illinois

Wider weather episode

High temperatures reached the lower to middle 90s during the afternoon of the 21st. Coupled with dewpoints in the lower and middle 70s, peak heat indices were as high as around 105 degrees around northern Illinois.

Source: NOAA Storm Events Database, event_id 1272827. Narrative written by the NWS forecast office that issued the report.