Coastal Waters Forecast for Wilmette Harbor to Northerly Island IL (LMZ741) (Text-Only)
NWS Forecast for: Wilmette Harbor to Northerly Island IL (LMZ741)
Issued by: National Weather Service Chicago, IL
Last Update: 1201 PM CST Sun Jan 11 2026




Rest Of Today: Northwest winds 20 to 25 kt becoming west and diminishing to 15 to 20 kt. Mostly cloudy. Waves 3 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft.

Tonight: Southwest winds 15 to 25 kt. Partly cloudy. Waves 3 to 5 ft subsiding to 2 to 4 ft.

Monday: Southwest winds 15 to 25 kt diminishing to 10 to 20 kt. Partly cloudy. Waves 2 to 4 ft subsiding to 1 to 3 ft.

Monday Night: Southwest winds 10 to 20 kt. Mostly clear in the evening, then becoming mostly cloudy. Waves 1 to 3 ft.







Zone Forecast: Wilmette Harbor to Northerly Island IL (LMZ741)

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