Coastal Waters Forecast for Northerly Island to Calumet Harbor IL (LMZ742) (Text-Only)
NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742)
Issued by: National Weather Service Chicago, IL
Last Update: 325 AM CST Fri Nov 28 2025
Print




Today: Northwest winds 20 to 25 kt diminishing to 10 to 15 kt. Partly cloudy. Waves 3 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.

Tonight: West winds around 10 kt becoming south overnight. Snow likely overnight. Waves 1 to 2 ft.

Saturday: South winds 10 to 20 kt becoming southeast and increasing to 20 to 25 kt. Snow. Waves 2 to 4 ft building to 5 to 8 ft occasionally to 10 ft.

Saturday Night: Southeast winds 20 to 25 kt becoming west 15 to 25 kt overnight. Snow and slight chance of rain. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft occasionally to 8 ft.







Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742)

Visit your local NWS office at: https://www.weather.gov/lot