Chicago, IL – A dangerous and prolonged heat wave is forecast to hit the Midwest beginning Friday, with high temperatures and humidity pushing heat index values above 100 degrees across multiple states including Illinois, Indiana, and Ohio.
According to the National Weather Service’s Weather Prediction Center, this marks the first major heat event of the season, with maximum daily heat risks classified as “Major” to “Extreme” from Friday through Sunday. The core of the heat will sweep across the Plains and central Midwest before expanding eastward early next week.
Temperatures are expected to climb well into the 90s during the day, while warm overnight lows in the mid-70s will provide little relief—conditions that can be especially hazardous for people without access to cooling. The elevated humidity levels will significantly increase the heat index, with “feels-like” temperatures projected to exceed 100°F across large portions of the region.
By Monday, June 24, the heat wave is forecast to persist and spread further east, with the Weather Prediction Center identifying a High Risk (greater than 60%) of extreme heat over parts of the Ohio Valley and into the Mid-Atlantic. Cities such as St. Louis, Indianapolis, Milwaukee, and Chicago are likely to experience prolonged high heat through at least early next week.
Health officials urge residents to take precautions: limit outdoor activities, stay hydrated, check on vulnerable individuals, and use air conditioning or access local cooling centers if available.
For safety tips and official updates, visit www.weather.gov/safety/heat.
