The Chicago area is bracing for a late-summer heat wave, with heat index values as high as 105 degrees possible in the coming days.
A heat advisory is set to take effect from noon to 9 p.m. on Tuesday and Wednesday for the following areas: LaSalle, Kendall, Grundy, Kankakee, Will and southern Cook counties in Illinois, along with Lake, Porter, Newton and Jasper counties in Indiana.
According to the National Weather Service, peak heat index values of 100 to 105 degrees are expected both afternoons.
Ahead of the heat surge, temperatures were already running above average on Monday, with highs expected to reach the mid-to-upper 80s.
With dew points near 70 degrees, humidity will likely continue to build, NBC 5 Storm Team Meteorologist Alicia Roman said. That will push heat index values, or “feels-like” temperatures, into the low 90s later on Monday before reaching the triple digits on Tuesday and Wednesday.
Actual air temperatures are expected to peak around 90 degrees on both Tuesday and Wednesday.
The NWS warns the combination of hot temperatures and high humidity may cause heat-related illnesses. Precautions are recommended, including drinking plenty of fluids, staying in air-conditioned rooms and limiting time in the sun.

Alicia Roman has the latest forecast for Monday, Aug. 31.
The Chicago area is bracing for a late-summer heat wave, with heat index values as high as 105 degrees possible in the coming days.
A heat advisory is set to take effect from noon to 9 p.m. on Tuesday and Wednesday for the following areas: LaSalle, Kendall, Grundy, Kankakee, Will and southern Cook counties in Illinois, along with Lake, Porter, Newton and Jasper counties in Indiana.
According to the National Weather Service, peak heat index values of 100 to 105 degrees are expected both afternoons.
Ahead of the heat surge, temperatures were already running above average on Monday, with highs expected to reach the mid-to-upper 80s.
With dew points near 70 degrees, humidity will likely continue to build, NBC 5 Storm Team Meteorologist Alicia Roman said. That will push heat index values, or "feels-like" temperatures, into the low 90s later on Monday before reaching the triple digits on Tuesday and Wednesday.
Actual air temperatures are expected to peak around 90 degrees on both Tuesday and Wednesday.
The NWS warns the combination of hot temperatures and high humidity may cause heat-related illnesses. Precautions are recommended, including drinking plenty of fluids, staying in air-conditioned rooms and limiting time in the sun.
| # | Наименование новости | Тональность | Информативность | Дата публикации |
|---|---|---|---|---|
| 1 | Heat advisory extended in parts of Chicago area as steamy conditions continue | 0 | 5.68 | 02-09-2026 |
| 2 | Chicago forecast: ‘Stifling' humidity and severe weather threat for 1st day of September | 0 | 10.22 | 01-09-2026 |
| 3 | ‘Temperature roller coaster' in store for Chicago area, officials warn | 0 | 4.6 | 12-09-2026 |
| 4 | Chicago Labor Day weekend forecast: Heat advisory still in effect. When will it finally cool off? | 0 | 6.83 | 04-09-2026 |
| 5 | Cluster of storms with flood potential could hit Chicago area overnight, early Friday | 0 | 7 | 03-09-2026 |
| 6 | Muggy conditions linger through part of Labor Day weekend before relief arrives | 0 | 7.88 | 05-09-2026 |
| 7 | Torrential downpours, widespread rain possible in Chicago area | 0 | 4.8 | 16-09-2026 |
| 8 | Chicago forecast: ‘Unsettled' weather pattern moves in with risk of strong to severe storms | 0 | 5.98 | 14-09-2026 |
| 9 | Weather Alert Day: Dangerous heat remains possible despite late-week storm chances | 0 | 12.89 | 07-08-2026 |