Chicago, IL – The most dangerous stretch of the ongoing heat wave is expected to continue across northern Illinois through Thursday, with peak heat index values climbing to around 105 degrees before thunderstorms bring some relief heading into the Independence Day weekend.
According to the National Weather Service Chicago, oppressive heat and humidity will persist through Thursday, making outdoor conditions hazardous during the afternoon and early evening hours. Officials say periodic thunderstorms are expected to develop beginning Thursday night, with additional chances Friday into July 4.
Wednesday is forecast to bring highs between 92 and 97 degrees, while humidity pushes peak heat index values to around 105 degrees. Similar conditions are expected Thursday, with afternoon temperatures reaching 91 to 96 degrees and heat indices again near 105 degrees.
Storm chances increase Thursday afternoon and evening, especially across parts of Illinois, before becoming more widespread Friday. Friday’s highs are expected to range from 90 to 93 degrees, with heat index values still approaching 100 degrees before scattered thunderstorms develop.
By Saturday, Independence Day temperatures are forecast to cool somewhat, with highs ranging from 83 to 89 degrees, although showers and thunderstorms remain possible across portions of the region.
Heat Safety Reminders
- Drink plenty of water, even if you don’t feel thirsty.
- Limit strenuous outdoor activities during the hottest part of the day.
- Take frequent breaks in air conditioning or shade.
- Never leave children or pets inside parked vehicles.
- Know the signs of heat exhaustion and heat stroke, and call 911 immediately if someone shows signs of heat stroke, including confusion, loss of consciousness or a body temperature above 104 degrees.
The National Weather Service encourages residents to continue monitoring the latest forecasts and any watches or warnings as thunderstorms develop later this week.
