Extreme Heat Watch Issued for Cook County Areas

An Extreme Heat Watch has been issued by the NWS Chicago IL for Northern Cook, Central Cook, and Southern Cook Counties. This watch is in effect from Monday afternoon, June 29, 2026, through Wednesday evening, July 1, 2026, with dangerously hot conditions expected.

The National Weather Service (NWS) Chicago IL issued an Extreme Heat Watch on June 28 at 2:47 AM CDT. This watch covers Northern Cook, Central Cook, and Southern Cook Counties in the US. The watch is active from Monday afternoon, June 29, 2026, and will remain in effect until Wednesday evening, July 1, 2026, at 10:00 PM CDT.

During the watch period, heat index values are projected to be around 105 each afternoon. These conditions are considered dangerously hot.

The NWS advises that significant increases in heat-related illnesses can occur during events of extreme heat and high humidity.

Why it is dangerous and what to do

⚠️ Safety

• Drink plenty of fluids.

• Stay in an air-conditioned room and out of the sun.

• Check on relatives and neighbors.

• Do not leave children or pets in unattended vehicles.

📊 The numbers, from wweather1 data

Chicago: now +25°, Mostly clear.

That is 1° above the June climate norm.

The record for this date is +37° (2012).

Three-day forecast: 28 June: +26°/+17° · 29 June: +36°/+23° · 30 June: +35°/+25°

The figures are computed automatically from the Open-Meteo/ERA5 archive — no eyeball estimates.

📰 Data source: NWS. Forecast and analysis — wweather1, based on Open-Meteo / met.no data.

Extreme Heat Watch Issued for Cook County Areas

Why it is dangerous and what to do

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