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: 318 AM CDT Thu Jun 4 2026
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Today: South winds 10 to 15 kt becoming southwest and increasing to 15 to 25 kt in the afternoon. Partly cloudy. Waves 1 to 3 ft.

Tonight: Southwest winds 10 to 20 kt diminishing to around 15 kt. Partly cloudy in the evening, then becoming mostly cloudy. Waves 1 to 3 ft.

Friday: South winds 15 to 20 kt becoming southwest 20 to 25 kt. Chance of showers and slight chance of thunderstorms in the morning, then showers likely and a chance of thunderstorms in the afternoon. Waves 2 to 4 ft. A small craft advisory may be needed.

Friday Night: Southwest winds 15 to 20 kt diminishing to 10 to 15 kt. Showers likely and a chance of thunderstorms in the evening, then showers likely and slight chance of thunderstorms overnight. Waves 1 to 3 ft.







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

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