FRIDAY: A second day with nearly 100% of the day’s possible sunshine. A bit warmer, especially inland following a cool start to the day. Winds: NE 4-12 mph. High: 80/71 lakeshore and area beaches.    

SATURDAY: Increasing cloudiness in the afternoon, warmer still.  High: 85/mid 70s immediate shoreline. Clouds thicken at night. A chance for showers late. 

Full forecast details and more at the WGN Weather Center blog

SUNDAY:  Mostly cloudy, becoming windy, much cooler. Showery spells, perhaps a clap of thunder.  High: 68/but temperatures falling into the upper 50s by evening.