The National Weather Service is warning that parts of Illinois could get so hot this week that the heat index could reach 110 degrees. It’s all part of a bigger heat wave that’s hitting the eastern half of the U.S.
The weather forecast predicts extremely hot weather until at least Thursday, July 2, 2026. The heat wave in Illinois comes as the eastern half of the US sees record-breaking heat. Temperatures are also expected to exceed 100 degrees in neighboring Wisconsin.
“A high or moderate extreme heat risk covers much of the US east of the Rockies on July 4-5, while a widespread slight risk will extend west to the Great Basin by July 7.” NWS predicted. Temperatures could reach 80 degrees at night, which will provide some relief over the July 4 weekend, the NWS reports. Extreme heat in Illinois and the rest of the Midwest and East Coast could persist through the July 4 weekend, NWS reported. “Dangerous heat continues for most of the week.”
Illinois weather forecast also warns of heat index 110 temperatures and covers 16 counties
illinois heat warning Includes “Robinson, Effingham, Flora, Lincoln, Petersburg, Sullivan, Greenup, Newton, Havana, Lawrenceville, Decatur, Springfield, Shelbyville, Taylorville, Olney and Pekin,” according to the NWS.
View detailed forecast for Central Illinois Here.
“For the first heat advisory, heat index values of 100 to 105 are expected. For the second heat advisory, heat index values of 105 to 110 are expected.” The second advisory will run from Monday, June 29, at 11 a.m. through Thursday, July 2, 2026.
Actual temperatures will be in the 90s, According to Fox Illinois.
The affected counties in Illinois are “Tazewell, Mason, Logan, Menard, Sangamon, Christian, Macon, Moultrie, Shelby, Cumberland, Effingham, Jasper, Crawford, Clay, Richland and Lawrence.” The first heat advisory was for June 28.
According to the National Weather ServiceFor southeastern Wisconsin, “heat impacts are expected during the work week, with heat index values 95 to 110 degree range Every day Mon. Through Venus.”
National Weather Service warns people in Illinois that extreme heat could be dangerous
- “Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun and keep checking on relatives and neighbors.”
- “Do not leave small children and pets unattended in vehicles. The interior of the car will reach lethal temperatures within minutes.”
- “Limit outdoor activities.”
- Wear sunscreen and light clothing.
- Work outside early or very late in the day.
- drink plenty of water.
“Hot temperatures and high humidity can lead to heat illnesses,” the NWS warns. “The combination of prolonged daytime heat and limited nighttime respite will increase the risk of heat-related illnesses, especially for vulnerable populations and those without adequate cooling.”
“Record-breaking dangerous heat will increase across the central portion of the country and slowly move eastward this week. Wildfire conditions will remain severe across parts of the Southwest and Great Basin through Monday. For the Northern Plains and Upper Midwest, large to very large hail and severe thunderstorms with severe winds are the primary threats.” NWS warned.
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