Chicago Weather October 11, 2024 6:59 pm CHICAGO FORECAST: Isolated thunderstorms, cooler temperatures Saturday Cooler temperatures and isolated thunderstorms are possible in the Chicago area for Saturday. Local 2:21 Monday evening forecast: Coldest weather of season coming 2:08 Monday forecast: Cool temps, lake-effect rain possible 3:11 Monday morning weather 1:56 Sunday morning forecast: Cooldown coming to Chicago area 2:25 CHICAGO'S FORECAST: More Seasonal October Weather