Coastal Waters Forecast for Grand Portage to Grand Marais MN (LSZ140) (Text-Only)
NWS Forecast for: Grand Portage to Grand Marais MN (LSZ140)
Issued by: National Weather Service Duluth, MN
Last Update: 508 PM CST Fri Jan 16 2026
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Tonight: North wind 15 to 20 knots. Gusts up to 30 knots increasing to 35 knots late in the night. Chance of snow. Waves 1 to 2 feet building to 1 to 3 feet late in the night.

Saturday: North wind 15 to 20 knots. Gusts up to 35 knots decreasing to 30 knots in the late morning and afternoon. Slight chance of snow through the day. Waves 2 to 4 feet subsiding to 1 to 3 feet late in the afternoon. A gale warning may be needed.

Saturday Night: Northwest wind 10 to 15 knots with gusts to around 20 knots becoming west 5 to 10 knots early in the morning. Slight chance of snow after midnight. Waves 1 to 2 feet.

Sunday: West wind 10 to 15 knots with gusts to around 20 knots becoming northwest 15 to 20 knots with gusts to around 30 knots late in the afternoon. Snow likely in the morning, then snow in the afternoon. Waves 1 to 3 feet building to 2 to 4 feet in the afternoon.

note...wave height forecasts are for ice free areas.







Zone Forecast: Grand Portage to Grand Marais MN (LSZ140)

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