CHICAGO — Mostly cloudy Friday with 50 percent rain/t’storm chance. Winds: SW 10-15 G25. High: 73.

Friday Night: Partly cloudy tonight with chance for showers/t’storms. Winds: NNW 10-15 G25. Low: 38.

Saturday:  Partly to mostly sunny as the day gets underway but clouds increase and thicken in the afternoon. Breezy, noticeably cooler. A new round of rain develops Saturday night. High: 51.   

Sunday: Cloudy, damp and chilly with periods of rain. Highs peak near 50 degrees then readings fall to near 40 degrees by evening.  Much colder overnight with lows dropping to near freezing.  High: 50. 

Full forecast details and more at the WGN Weather Center blog