WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.

Periods of rain still possible into Tuesday

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Thunderstorms with some severe weather have failed to materialize over Chicago during the past few days despite favorable storm conditions.
Instead, thunderstorms have popped in all directions around Chicago both Friday and Saturday. Conditions remain favorable for thunderstorms Monday and showers until about noon Tuesday, so holiday plans later in the day should go off without a hitch, especially from Chicago northward.
By Tuesday night, cooler, drier air from Canada sweeps in, followed by several days of sunny skies and a refreshing afternoon lake breeze. Temperatures and humidity creep higher later in the week and into next weekend, but scorching July heat should hold off until the following week. Current models indicate a string of 90°-plus days seem likely in a week to 10 days from now.
--Dennis Haller, WGN-TV Weather Center Meteorologist