| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 913 AM CDT Thu Jun 18 2026 |  |
Rest Of Today: Northwest winds 15 to 20 kt diminishing to around 10 kt. Mostly cloudy late in the morning, then becoming partly cloudy. Waves 1 to 3 ft. Tonight: West winds 10 to 15 kt. Mostly clear. Waves 1 to 2 ft. Friday: Northwest winds 10 to 15 kt. Sunny. Waves 1 to 2 ft. Friday Night: Southwest winds around 10 kt becoming west. Chance of showers and slight chance of thunderstorms in the evening, then slight chance of showers overnight. Waves 1 ft or less. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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