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: 957 AM CST Sat Dec 27 2025




Rest Of Today: Southeast winds 5 to 10 kt increasing to 10 to 20 kt late this morning. Cloudy. Waves 1 to 2 ft building to 2 to 4 ft.

Tonight: Southeast winds 10 to 20 kt becoming south 10 to 15 kt. Patchy fog. Showers likely after midnight. Waves 3 to 5 ft subsiding to 2 to 4 ft.

Sunday: South winds 10 to 15 kt. Patchy fog in the morning. showers and slight chance of thunderstorms. Waves 2 to 4 ft.

Sunday Night: Winds quickly shifting to west and increasing to storm force to 50 kt in the evening. Rain showers and a slight chance of thunderstorms in the evening, then scattered rain showers changing to snow showers overnight. Waves 3 to 5 ft building to 4 to 7 ft occasionally to 9 ft.







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

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