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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 36 °F
Light Wind
< 1ft
Tonight
Low: 31 °F
⇑SW 20kt
5ft

Gale Warning
Sunday
High: 43 °F
WSW 15kt
3-5ft

Gale Warning
Sunday Night
Low: 34 °F
WSW 15kt
2-3ft
Monday
High: 38 °F
W 15kt
1-2ft
Monday Night
Low: 22 °F
NE 10kt
< 1ft
Tuesday
High: 27 °F
ENE 15kt
< 1ft
Tuesday Night
Low: 20 °F
NNE 15kt
1-2ft
Wednesday
High: 26 °F
NNE 15kt
1-2ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 12:21 pm CST Mar 7, 2026
Forecast Valid: 2pm CST Mar 7, 2026-6pm CDT Mar 13, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

Variable winds 5 kt or less. Sunny. Waves 1 ft or less.

Tonight

SW wind 5 to 10 kt increasing to 15 to 20 kt after midnight. Winds could gust as high as 35 kt. Snow likely, mainly before 2am. Waves 1 ft or less building to 5 ft.

Sunday

WSW wind 10 to 15 kt, with gusts as high as 30 kt. A slight chance of rain after 5pm. Waves 3 to 5 ft.

Sunday Night

WSW wind 10 to 15 kt, with gusts as high as 30 kt. A slight chance of rain before 3am, then a slight chance of rain and snow. Waves 2 to 3 ft.

Monday

W wind 5 to 15 kt, with gusts as high as 30 kt. Mostly sunny. Waves 1 to 2 ft.

Monday Night

WNW wind 5 to 10 kt becoming NE after midnight. Winds could gust as high as 15 kt. A slight chance of snow after midnight. Waves 1 ft or less.

Tuesday

ENE wind 10 to 15 kt, with gusts as high as 25 kt. A chance of snow. Waves 1 ft or less.

Tuesday Night

NNE wind around 15 kt, with gusts as high as 25 kt. A chance of snow. Waves 1 to 2 ft.

Wednesday

NNE wind 10 to 15 kt, with gusts as high as 25 kt. A slight chance of snow. Waves 1 to 2 ft.

*Notices:

This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area. Forecast information for a larger area can be found within the zone forecast and the NDFD graphics.
The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc. These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.