weather in northbrook, il, hourly
Hourly Forecast Detailed. 1  0am:The Northbrook, IL forecast for Aug 14 is 67 degrees and Partly cloudy. 2  3am:The Northbrook, IL forecast for Aug 14 is 66 degrees and Partly cloudy. 3  6am:The Northbrook, IL forecast for Aug 14 is 69 degrees and Sunny. 4  9am:The Northbrook, IL forecast for Aug 14 is 76 degrees and Partly cloudy.