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

It’ll be autumn in August the next two days

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Taking a cue from this week’s school year start-up in many suburban areas, the season’s first autumnal chill will arrive in Chicago today amidst gusty north winds and a cloud-filled sky. After one of the hottest summers in recent years, light jackets and sweaters will be in order tonight and early Tuesday as temperatures drop into the 50s. With a bit more sun, readings will rebound into the middle 70s Tuesday, and by the end of the week summer will be back in control with the mercury once again pushing the 90º mark.
While the record early season activity in the tropical Atlantic Basin has quieted down, and the area is currently storm free, Japan is bracing for a direct hit from Typhoon Mawar.
Passing near the island of Iwo Jima Sunday night, the typhoon is forecast to make landfall on the central Japan coastline between Osaka and Tokyo on Wednesday with winds as high as 140 m.p.h.