| NWS Forecast for: Winthrop Harbor to Wilmette Harbor IL (LMZ740) Issued by: National Weather Service Chicago, IL Last Update: 220 PM CDT Tue Jun 16 2026 | |
Late This Afternoon: Southwest winds to 30 kt with occasional gales to 35 kt. Chance of showers and thunderstorms. Waves 2 to 4 ft. Tonight: West winds 20 to 25 kt becoming southwest and diminishing to 10 to 15 kt. Partly cloudy. Waves 2 to 4 ft subsiding to 1 to 2 ft. Wednesday: South winds 10 to 20 kt becoming east and increasing to 30 kt. Showers and thunderstorms. Some thunderstorms may be severe in the afternoon. Waves around 1 ft building to 4 to 7 ft occasionally to 9 ft. Wednesday Night: Southwest winds 15 to 25 kt becoming west. Thunderstorms likely and a chance of showers in the evening. Waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to 4 ft. Thursday: West winds 20 to 25 kt becoming northwest 10 to 20 kt. Slight chance of showers in the afternoon. Waves 2 to 4 ft. | |
| Zone Forecast: Winthrop Harbor to Wilmette Harbor IL (LMZ740) | |
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