| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 851 AM CDT Fri Oct 16 2026 |  |
Rest Of Today: Northwest winds to 30 kt becoming north and increasing to 40 kt gales. Chance of showers late this morning, then scattered showers in the afternoon. Slight chance of waterspouts in the afternoon. Waves 3 to 5 ft building to 8 to 12 ft occasionally to 16 ft. Tonight: North gales to 40 kt diminishing to 30 kt. Slight chance of showers in the evening. Waves 10 to 14 ft occasionally to 18 ft subsiding to 8 to 12 ft occasionally to 16 ft. Saturday: Northwest winds 10 to 20 kt becoming southwest 10 to 15 kt in the afternoon. Sunny. Waves 5 to 8 ft occasionally to 10 ft subsiding to 3 to 5 ft. Saturday Night: Southwest winds 10 to 15 kt. Clear. Waves 1 to 3 ft. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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