| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 947 PM CST Sun Jan 18 2026 |  |
Rest Of Tonight: Southwest winds 15 to 25 kt becoming northwest and increasing to 40 kt gales around midnight. Snow in the evening, then scattered snow showers after midnight. Freezing spray after midnight. Waves 1 to 3 ft building to 5 to 8 ft occasionally to 10 ft. Monday: West gales to 40 kt diminishing to 30 kt by early afternoon. Freezing spray in the morning. Isolated snow showers in the morning. Waves 5 to 8 ft occasionally to 10 ft subsiding to 3 to 5 ft. Monday Night: West winds to 30 kt diminishing to 15 to 20 kt. Mostly cloudy in the evening, then becoming partly cloudy. Waves 2 to 4 ft subsiding to 1 to 3 ft. Tuesday: West winds 10 to 15 kt becoming southwest. Mostly sunny in the morning, then becoming partly cloudy. Waves 1 to 3 ft. wave heights are for ice free areas. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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