| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 316 AM CST Wed Feb 18 2026 |  |
Today: Southwest winds to 30 kt easing to 20 to 25 kt late. slight chance of showers early in the morning. Waves 2 to 4 ft. Tonight: Southwest winds 10 to 20 kt becoming south and diminishing to around 10 kt overnight. Partly cloudy in the evening, then becoming mostly cloudy. Waves 1 to 2 ft. Thursday: Southeast winds 10 to 15 kt. Slight chance of rain in the morning, then chance of rain in the afternoon. Waves 1 to 2 ft building to 2 to 4 ft. Thursday Night: Southeast winds 15 to 25 kt becoming southwest overnight. Rain likely and slight chance of thunderstorms in the evening, then chance of rain overnight. Waves 3 to 5 ft. wave heights are for ice free areas. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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