| NWS Forecast for: Winthrop Harbor to Wilmette Harbor IL (LMZ740) Issued by: National Weather Service Chicago, IL Last Update: 909 PM CDT Wed Mar 25 2026 | |
Rest Of Tonight: Southwest winds 10 to 20 kt. Mostly cloudy. waves 1 to 2 ft. Thursday: West winds 10 to 15 kt shifting north and rapidly increasing to 35 kt gales in the afternoon. Patchy fog. Slight chance of showers in the morning, then showers and a chance of thunderstorms in the afternoon. Waves around 1 ft building to 3 to 5 ft. Thursday Night: North gales to 35 kt. Rain showers with thunderstorms likely in the evening. Some thunderstorms may be severe. Waves 7 to 10 ft occasionally to 13 ft building to 8 to 11 ft occasionally to 14 ft. Friday: North winds to 30 kt diminishing to 10 to 20 kt. Mostly cloudy in the morning, then becoming partly cloudy. Waves 7 to 10 ft occasionally to 13 ft subsiding to 4 to 7 ft occasionally to 9 ft. | |
| Zone Forecast: Winthrop Harbor to Wilmette Harbor IL (LMZ740) | |
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