Coastal Waters Forecast for Ontonagon to Upper Entrance of Portage Canal MI (LSZ242) (Text-Only)
NWS Forecast for: Ontonagon to Upper Entrance of Portage Canal MI (LSZ242)
Issued by: National Weather Service Marquette, MI
Last Update: 1100 AM EDT Mon Jul 20 2026




Rest Of Today: Southwest wind 15 to 20 knots with gusts up to 31 knots. Partly cloudy with a slight chance of showers and thunderstorms. Some thunderstorms may be severe late. Waves 2 to 4 feet building to 3 to 5 feet occasionally to 7 feet.

Tonight: West wind 15 to 20 knots. Gusts up to 30 knots. Partly cloudy through midnight then becoming mostly cloudy. Patchy smoke through midnight. A slight chance of thunderstorms through late evening. A slight chance of showers through midnight, then a chance of showers late. Some thunderstorms may be severe. Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.

Tuesday: Northwest wind 15 to 25 knots with gusts up to 32 knots. Mostly cloudy. A slight chance of showers in the morning. Waves building to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet.

Tuesday Night: Northwest wind 10 to 20 knots. Mostly clear. Waves subsiding to 1 to 2 feet.







Zone Forecast: Ontonagon to Upper Entrance of Portage Canal MI (LSZ242)

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