Coastal Waters Forecast for Munising to Grand Marais MI (LSZ250) (Text-Only)
NWS Forecast for: Munising to Grand Marais MI (LSZ250)
Issued by: National Weather Service Marquette, MI
Last Update: 1102 PM EDT Mon May 18 2026




Rest Of Tonight: East wind less than 10 knots veering south 10 to 15 knots late. Gusts up to 23 knots after midnight. Cloudy. Areas of dense fog through the night. A chance of rain showers and a slight chance of thunderstorms late. Waves calm to 1 foot building to 1 to 2 feet.

Tuesday: Southwest wind 15 to 20 knots veering northwest 20 to 25 knots late. Gusts up to 32 knots. Mostly cloudy. Patchy fog through mid morning. A chance of rain showers and a slight chance of thunderstorms through mid morning, then a chance of rain showers by late morning. Waves building to 5 to 8 feet occasionally to 10 feet.

Tuesday Night: Northwest wind 15 to 20 knots with gusts up to 27 knots. Mostly cloudy. Waves subsiding to 3 to 6 feet occasionally to 8 feet, then building to 4 to 7 feet occasionally to 9 feet.

Wednesday: Northwest wind 15 to 20 knots diminishing to 5 to 15 knots in the afternoon. Partly cloudy in the morning then clearing. Waves subsiding to 2 to 3 feet.







Zone Forecast: Munising to Grand Marais MI (LSZ250)

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