Coastal Waters Forecast for Calumet Harbor IL to Gary IN (LMZ743) (Text-Only)
NWS Forecast for: Calumet Harbor IL to Gary IN (LMZ743)
Issued by: National Weather Service Chicago, IL
Last Update: 318 AM CDT Thu Jun 4 2026


Today: South winds around 10 kt increasing to 15 to 20 kt in the afternoon. Partly cloudy. Waves 1 to 2 ft.

Tonight: South winds 15 to 20 kt. Partly cloudy. Waves 1 to 2 ft.

Friday: South winds 15 to 20 kt becoming southwest 20 to 25 kt. Chance of showers and slight chance of thunderstorms in the morning, then showers likely and a chance of thunderstorms in the afternoon. Waves 1 to 3 ft. A small craft advisory may be needed.

Friday Night: Southwest winds 15 to 20 kt diminishing to 10 to 15 kt. Showers and a chance of thunderstorms in the evening, then showers and slight chance of thunderstorms overnight. Waves 1 to 3 ft.







Zone Forecast: Calumet Harbor IL to Gary IN (LMZ743)

Visit your local NWS office at: https://www.weather.gov/lot