It’s hot in Chicago.
The Windy City is in the midst of its first major heatwave of summer 2026, as oppressive temperatures and elevated humidity descend upon the region.
Here’s how long the extreme temperatures will last and how to stay safe over the coming days.
Extreme Heat Warning in effect through Wednesday
The National Weather Service (NWS) has issued and extreme heat warning for Cook County, effective through Wednesday, July 1 at 10 p.m.
Monday’s high topped out at 91 degrees, with a heat index value of 99 degrees.
Tuesday, conditions will worsen, with a high of 95 degrees and a heat index value of 104 degrees, according to the NWS.
Conditions will remain the same Wednesday, with a high of 95 degrees and sunny skies all day.
Heat to gradually decrease through end of week
While the Extreme Heat Warning will end come Thursday, temperatures will remain high for the remainder of the week.
Thursday will see a high of 94 degrees, with a chance of overnight Thunderstorms. Additional showers are possible Friday, along with a high of 88 degrees.
For the Fourth of July on Saturday, expect a high of 84 degrees and mostly sunny conditions.
Similar conditions will follow on Sunday, along with another chance of thunderstorms.
Heatwave safety tips
During periods of extreme heat in Chicago, it’s important to take certain precautions to ensure your safety.
The Chicago Office of Emergency Management & Communications (OEMC) notes that “Heat-related illnesses increase significantly during extreme heat and high humidity events.”
Here are a few heatwave safety tips according to OEMC:
- Stay hydrated—drink lots of water, avoid alcohol, caffeine, sodas.
- Stay inside; if you do not have air conditioning, keep shades drawn and blinds closed, but windows slightly open.
- Keep electric lights off or turn them down.
- Minimize use of your oven and stove.
- Wear loose, light, cotton clothing.
- Take cool baths and showers.
- Do not leave anyone (including pets) in a parked car, even for a few minutes.
For more information on extreme heat safety in Chicago, click here.
