Excessive Heat in Northern Cook County, Illinois

Excessive Heat June 29, 2026 – June 30, 2026 · Northern Cook County, Illinois

The wider storm

Hot and humid conditions developed across northern Illinois on June 29th and continued on June 30th as well into early July. Peak heat index values ranged from 100 to 105 for most areas on both days with high temperatures in the lower to middle 90s.

Source: NOAA Storm Events Database, event 1351193. Narratives are written by the National Weather Service forecast office that issued the report.

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