Coastal Waters Forecast for Winthrop Harbor to Wilmette Harbor IL (LMZ740) (Text-Only)
NWS Forecast for: Winthrop Harbor to Wilmette Harbor IL (LMZ740)
Issued by: National Weather Service Chicago, IL
Last Update: 305 AM CDT Fri Apr 24 2026




Today: South winds 10 to 15 kt becoming west late. Chance of showers in the morning, then chance of showers and thunderstorms in the afternoon. Waves 2 to 4 ft subsiding to 1 to 3 ft.

Tonight: Northwest winds 10 to 15 kt becoming north. Mostly cloudy. Waves 1 to 3 ft.

Saturday: North winds 10 to 15 kt increasing to 15 to 20 kt. Decreasing cloud cover. Waves 2 to 4 ft.

Saturday Night: North winds 10 to 20 kt becoming northeast and diminishing to around 10 kt overnight. Increasing cloudiness. waves 2 to 4 ft.







Zone Forecast: Winthrop Harbor to Wilmette Harbor IL (LMZ740)

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