CHICAGO — Mostly cloudy Friday with a slight chance for showers. Wide temp range, highs between 83/77 degrees. Winds: NNE 5-10.

FRIDAY NIGHT: A lingering shower or thunderstorm in the evening possible otherwise becoming partly cloudy, cooler, less humid. Low: 66.  

SATURDAY: Partly sunny, breezy, markedly cooler, and much less humid. Northeast winds 10-20 mph create a 3–6-foot chop on Lake Michigan, making for dangerous swimming conditions. High: 76/near 70 lakeshore.

SUNDAY: Becoming mostly sunny, a bit cool but eminently comfortable. High: 74/modestly cooler near the lake.   

MONDAY: A good deal of sunshine, warmer and more seasonable by afternoon. Clouds increase at night bringing a small chance for a few showers.  High: 80.