Last Update: 401 PM EDT Sun Sep 20 2026

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Marquette, MI Local Forecast Office

30NM SE Grand Portage MN

Marine Zone Forecast

Late This Afternoon
Northeast winds 20 to 30 knots. Waves 3 to 6 feet occasionally to 8 feet.
Tonight
Northeast winds 15 to 25 knots becoming east 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
Monday
East winds 5 to 15 knots increasing to 15 to 25 knots. Waves building to 1 to 3 feet.
Monday Night
East winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
Tuesday
East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves calm to 2 feet.
Tuesday Night
East winds 10 to 20 knots becoming southeast 5 to 15 knots after midnight. Waves calm to 2 feet.
Wednesday
Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet.
Wednesday Night
Southeast winds 10 to 20 knots veering south after midnight. Waves calm to 2 feet.
Thursday
South winds 5 to 15 knots. Waves calm to 2 feet.
Friday
South winds 5 to 15 knots backing southeast. Waves calm to 2 feet.



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401 PM EDT Sun Sep 20 2026
 
 

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