| NWS Forecast for: Winthrop Harbor to Wilmette Harbor IL (LMZ740) Issued by: National Weather Service Chicago, IL Last Update: 854 PM CDT Mon Jun 15 2026 |  |
Rest Of Tonight: Southwest winds 10 to 20 kt. Partly cloudy. waves 1 to 2 ft. Tuesday: Southwest winds 15 to 25 kt increasing to 30 kt. Chance of showers and slight chance of thunderstorms. Waves 2 to 4 ft. Tuesday Night: West winds 20 to 25 kt diminishing to 10 to 15 kt. Mostly clear in the evening, then becoming partly cloudy. waves 1 to 3 ft. Wednesday: South winds 10 to 15 kt becoming southeast and increasing to 30 kt. Showers likely and a chance of thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Waves 1 to 3 ft building to 4 to 7 ft occasionally to 9 ft. | |
| Zone Forecast: Winthrop Harbor to Wilmette Harbor IL (LMZ740) | |
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