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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Overnight
Low: 20 °F
NNE 15kt
< 1ft

Small Craft Advisory
Sunday
High: 28 °F
NNE 15kt
< 1ft

Small Craft Advisory
Sunday Night
Low: 20 °F
Light Wind
< 1ft
Monday
High: 33 °F
SSW 10kt
< 1ft
Monday Night
Low: 26 °F
SW 10kt
< 1ft
Tuesday
High: 36 °F
E 10kt
< 1ft
Tuesday Night
Low: 18 °F
NE 10kt
< 1ft
Wednesday
High: 30 °F
E 15kt
< 1ft
Wednesday Night
Low: 24 °F
SE 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: 11:06 pm CDT Mar 21, 2026
Forecast Valid: 12am CDT Mar 22, 2026-6pm CDT Mar 28, 2026

View Nearby Observations

Detailed Forecast

Overnight

NNE wind around 15 kt, with gusts as high as 25 kt. Mostly cloudy. Waves 1 ft or less.

Sunday

NNE wind 5 to 15 kt, with gusts as high as 25 kt. Mostly sunny. Waves 1 ft or less.

Sunday Night

Variable winds 5 kt or less. Mostly cloudy. Waves 1 ft or less.

Monday

WNW wind 5 to 10 kt becoming SSW in the afternoon. Sunny. Waves 1 ft or less.

Monday Night

SSW wind around 10 kt becoming W after midnight. Winds could gust as high as 20 kt. A slight chance of snow after 1am. Waves 1 ft or less.

Tuesday

NW wind 5 to 10 kt becoming E in the afternoon. Partly sunny. Waves 1 ft or less.

Tuesday Night

E wind around 10 kt becoming NE after midnight. Winds could gust as high as 20 kt. A slight chance of snow after 1am. Waves 1 ft or less.

Wednesday

E wind 10 to 15 kt. A chance of snow. Waves 1 ft or less.

Wednesday Night

E wind 10 to 15 kt becoming SE after midnight. Winds could gust as high as 20 kt. A chance of snow before 1am, then rain and snow likely. 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.