A few storms moved through the Chicago area on Sunday, and some storms are also possible before sunrise on Monday, AccuWeather Meteorologist Jaisol Martinez said.
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But those storms are not expected to hinder the building heat and humidity.
The National Weather Service issued a Heat Advisory for Boone, Cook, DeKalb, Will, Grundy, Kane, Kankakee, Kendall, LaSalle, Lake (IL), Livingston, McHenry, Ogle, Winnebago, Newton, Jasper, Lake (IN) and Porter counties from noon to 8 p.m. Monday.
Peak heat indices are forecast to be in the 100-110 degree range, especially on Monday, the NWS said.
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AccuWeather Meteorologist Greg Dutra said temperatures in parts of the area will exceed 105 degrees on Monday afternoon.
Tuesday is expected to remain hot and humid before rain chances increase again on Wednesday as a cold front approaches the area.
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Temperatures will drop below average, into the 70s, later this week. Low humidity is expected on Thursday through Sunday.
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