Chicago Bakes Under Prolonged Extreme Heat — But Change Is on the Horizon By Gerry P | June 23, 2025

For the third consecutive day, Chicago is in the grip of an extreme heat wave that has pushed temperatures well into the upper 90s, with heat index values consistently reaching between 100 and 105 degrees. The National Weather Service has extended its Extreme Heat Warning through midnight tonight, urging residents to take serious precautions amid dangerous conditions.

A Dangerous Combination

What makes this heat wave particularly hazardous isn’t just the daytime highs — it’s the lack of relief at night. Overnight temperatures have remained abnormally high, with lows struggling to fall below 80 degrees in many areas. This pattern puts added stress on the body, especially for vulnerable populations like the elderly, young children, and those with preexisting health conditions.

According to meteorologists, the heat is compounded by oppressive humidity and stagnant air, which limits the body’s ability to cool itself. The urban heat island effect across the city is also intensifying the discomfort, particularly in dense neighborhoods with limited green space or airflow.

Public Health at Risk

City health officials are warning that heat-related illnesses — including heat exhaustion and heat stroke — are likely to increase. Emergency services have already seen an uptick in calls related to dehydration, dizziness, and heat-induced fatigue.

Local authorities are urging people to avoid strenuous outdoor activities, stay indoors when possible, drink plenty of water, and check on relatives and neighbors, particularly those without air conditioning.

Cooling centers remain open throughout the city, and residents are encouraged to call 311 for help finding the nearest location. City libraries, senior centers, and select park district facilities are also offering temporary relief from the heat.

Remembering 1995

This week’s conditions are a stark reminder of the infamous 1995 heat wave that claimed more than 700 lives in Chicago. Many of the same risk factors are present today: prolonged heat, high overnight temperatures, and social isolation. Officials are working to avoid a repeat of history by conducting wellness checks, expanding shelter access, and encouraging community outreach.

Rain and Relief Approaching

There is good news on the horizon. A cold front is expected to move through the region late Tuesday, bringing with it scattered thunderstorms and the potential for heavy rain. This shift in the weather is expected to push daytime temperatures back down into the mid-to-low 80s for much of the week, offering a much-needed break from the brutal heat.

However, the storms could also bring their own hazards, including localized flooding and damaging wind gusts. Residents are advised to stay weather-aware, especially during the afternoon and evening hours on Tuesday and Wednesday.

Final Thoughts

Extreme heat is more than an inconvenience — it’s a public health emergency. The current conditions demand respect and preparation. As the city braces for another hot day and prepares for incoming storms, staying informed and taking simple protective steps can make all the difference.

The heat wave may soon break, but the lessons it brings about climate, infrastructure, and community responsibility are here to stay.

Stay tuned to local weather updates, take care of one another, and keep cool — Chicago weather is shifting, but the danger is not over yet.