A heat advisory goes into effect Monday as the heat index could top 100 degrees, ABC7 meteorologist Tracy Butler said.
Temperatures were already the 80s early Monday. However, Tracy Butler says systems moving south and southeast could bring a few strong thunderstorms to the Chicago area. The National Weather Service says a high pressure system will bring hot and humid conditions lasting through most of the week.
As temperatures rise, the county public health department say their tips include limiting time outdoors, drinking plenty of water and wearing loose fitting clothes. Health officials are also urging the public to keep a close eye on infants and the elderly.
Heat advisories, warnings and watches have been issued for counties statewide.
Chicago officials say half a dozen cooling centers will be open this week. That includes libraries, police stations and park buildings.