| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 225 PM CDT Mon May 4 2026 | |
Late This Afternoon: Southwest winds to 30 kt. Partly cloudy. Waves 2 to 4 ft. Tonight: Southwest winds 15 to 25 kt becoming northwest 10 to 15 kt. Scattered gusty thunderstorms. Waves 1 to 3 ft. Tuesday: Northwest winds 10 to 15 kt becoming east. Slight chance of showers in the morning. Waves 1 to 2 ft. Tuesday Night: Southeast winds around 10 kt becoming northwest overnight. Mostly cloudy. Waves 1 to 2 ft. Wednesday: North winds around 10 kt becoming northeast in the afternoon. Mostly cloudy. Waves 1 to 2 ft. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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