| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 250 AM CDT Wed Jun 17 2026 |  |
Early This Morning: Southwest winds 10 to 15 kt. Mostly cloudy. Waves around 1 ft. Today: South winds 10 to 20 kt becoming southeast and increasing to 30 kt. Showers and slight chance of thunderstorms in the morning, then showers and thunderstorms in the afternoon. Some thunderstorms may be severe in the afternoon. Waves around 1 ft quickly building to 4 to 7 ft occasionally to 9 ft. Tonight: Southwest winds 20 to 25 kt becoming west. Chance of showers and thunderstorms in the evening. Some thunderstorms may be severe. Waves 4 to 7 ft occasionally to 9 ft subsiding to 1 to 3 ft. Thursday: West winds 20 to 25 kt becoming northwest and diminishing to 10 to 15 kt in the morning. Mostly cloudy in the morning then clearing. Waves 2 to 4 ft subsiding to 1 to 3 ft. Thursday Night: West winds 10 to 15 kt. Mostly clear. Waves 1 to 2 ft. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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