Hour-By-Hour Look At Friday's Extreme Heat For Chicagoland

If you're spending some time outside this weekend to celebrate the upcoming Independence Day holiday, you will want to be careful and dress very cool. An excessive heat warning has been issued starting at 11 a.m. on Friday morning through 7 p.m. Saturday.

According to the National Weather Service, afternoon high temperatures will be in the mid 90s, and peak heat indices will be in the 110 to 120 degree range. The high temperatures, combined with sunshine and humidity, will lead to potentially hazardous conditions. There will be little relief at night, as temps will remain near 80 degrees.

The NWS said the highest heat indexes will be Friday and Saturday afternoon. To be safe in the heat, you should stay hydrated and take frequent breaks in air conditioning or in the shade. The NWS advises to minimize sun exposure and to wear sunscreen and light, loose-fitting clothing if you're outside.

Chicago residents need to be especially careful as urban settings are usually 3 to 5 degrees warmer than rural places at night, according to the NWS. Chicago residents can call 311 to locate a cooling center near them.

Here's a look at the hour-by-hour forecast at Chicago's O'Hare International Airport for Friday:

• 9 a.m. - Sunny, 82 degrees; heat index, 87.
• 10 a.m. - Sunny, 85 degrees; heat index, 93.
• 11 a.m. - Sunny, 88 degrees; heat index, 97.
• 12 p.m. - Sunny, 90 degrees; heat index, 99.
• 1 p.m. - Sunny, 91 degrees; heat index, 103.
• 2 p.m. - Sunny, 92 degrees; heat index, 106.
• 3 p.m. - Sunny, 94 degrees; heat index, 109.
• 4 p.m. - Sunny, 94 degrees; heat index, 110.
• 5 p.m. - Sunny, 94 degrees; heat index, 110.
• 6 p.m. - Sunny, 93 degrees; heat index, 109.
• 7 p.m. -Sunny, 91 degrees; heat index, 106.
• 8 p.m. - Sunny, 88 degrees; heat index, 103.
• 9 p.m. - Mostly clear, 86 degrees; heat index, 100.
• 10 p.m. - Mostly clear, 84 degrees; heat index, 98.
• 11 p.m. - Mostly clear, 82 degrees; heat index, 97.

After the heat on Friday and Saturday, an approaching cold front will bring rain and storms on Sunday and cool the area slightly. Some storms could be severe on Sunday, according to the NWS. Temps into the start of the work week will also remain near 90 degrees.

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