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: 219 PM CST Thu Nov 27 2025




Tonight: Northwest winds to 30 kt diminishing to 20 to 25 kt. A chance of flurries in the evening. Waves 3 to 6 ft occasionally to 8 ft.

Friday: Northwest winds 20 to 25 kt diminishing to 10 to 15 kt in the afternoon. Partly cloudy. Waves 3 to 5 ft subsiding to 2 to 4 ft.

Friday Night: West winds around 10 kt becoming southwest overnight. Chance of snow overnight. Waves 1 to 2 ft.

Saturday: South winds 10 to 20 kt becoming southeast 20 to 25 kt. Snow. Waves 2 to 4 ft building to 4 to 7 ft occasionally to 9 ft.







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

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