| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 246 PM CDT Wed Apr 8 2026 |  |
Tonight: South winds to 30 kt with a few gale force gusts to 35 kt through this evening, becoming southwest 15 to 25 kt after midnight. Chance of showers and slight chance of thunderstorms after midnight. Waves 3 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft late. Thursday: Southwest winds 15 to 20 kt becoming west 10 to 15 kt by mid-morning. Chance of showers in the morning. Waves 1 to 3 ft. Thursday Night: Northeast winds 10 to 15 kt. Rain showers and slight chance of thunderstorms in the evening, then showers overnight. Waves 1 to 2 ft. Friday: North winds 10 to 15 kt becoming northeast. Rain showers likely in the morning. Waves 1 to 2 ft. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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