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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tonight
Low: 4 °F
N 10kt
< 1ft

Small Craft Advisory
Thursday
High: 22 °F
⇑SSW 20kt
5ft
Thursday Night
Low: 19 °F
SW 15kt⇓
5ft
Friday
High: 26 °F
NNW 10kt
< 1ft
Friday Night
Low: 9 °F
N 15kt
< 1ft
Saturday
High: 13 °F
N 15kt
< 1ft
Saturday Night
Low: -4 °F
NNW 10kt
< 1ft
Sunday
High: 8 °F
W 15kt
< 1ft
Sunday Night
Low: -6 °F
NNW 15kt
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 5:56 pm CST Jan 14, 2026
Forecast Valid: 7pm CST Jan 14, 2026-6pm CST Jan 21, 2026

View Nearby Observations

Detailed Forecast

Tonight

N wind 5 to 10 kt becoming W after midnight. Winds could gust as high as 20 kt. Increasing clouds. Waves 1 ft or less.

Thursday

SSW wind 5 to 10 kt increasing to 15 to 20 kt in the afternoon. Winds could gust as high as 25 kt. Snow likely, mainly after 11am. Widespread freezing spray after 3pm. Waves 1 ft or less building to 5 ft.

Thursday Night

SW wind 10 to 15 kt becoming WNW 5 to 10 kt after midnight. Winds could gust as high as 25 kt. Snow likely, mainly before 9pm. Widespread freezing spray before 7pm. Waves 5 ft subsiding to 1 ft.

Friday

NNW wind 5 to 10 kt, with gusts as high as 25 kt. Snow likely, mainly after noon. Waves 1 ft or less.

Friday Night

N wind around 15 kt, with gusts as high as 30 kt. A slight chance of snow before midnight. Waves 1 ft or less.

Saturday

N wind around 15 kt, with gusts as high as 30 kt. A slight chance of snow. Waves 1 ft or less.

Saturday Night

NNW wind around 10 kt, with gusts as high as 25 kt. Mostly cloudy. Waves 1 ft or less.

Sunday

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

Sunday Night

NNW wind around 15 kt, with gusts as high as 30 kt. A slight chance of snow. Waves 1 ft or less.

*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.