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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tonight
Low: 31 °F
Light Wind
< 1ft
Saturday
High: 36 °F
E 10kt
< 1ft
Saturday Night
Low: 23 °F
NNE 15kt
< 1ft
Sunday
High: 28 °F
NNE 15kt
< 1ft
Sunday Night
Low: 20 °F
Light Wind
< 1ft
Monday
High: 33 °F
SSW 10kt
< 1ft
Monday Night
Low: 29 °F
WSW 15kt
< 1ft
Tuesday
High: 36 °F
W 15kt
< 1ft
Tuesday Night
Low: 16 °F
N 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: 1:21 pm CDT Mar 20, 2026
Forecast Valid: 4pm CDT Mar 20, 2026-6pm CDT Mar 27, 2026

View Nearby Observations

Detailed Forecast

Tonight

Variable winds 5 kt or less. A chance of snow, mainly after 5am. Waves 1 ft or less.

Saturday

E wind around 10 kt. Rain and snow likely before 4pm, then a slight chance of snow between 4pm and 5pm, then a slight chance of rain and snow after 5pm. Patchy fog before 4pm. Waves 1 ft or less.

Saturday Night

NNE wind 10 to 15 kt, with gusts as high as 25 kt. A chance of rain and snow before 1am. Waves 1 ft or less.

Sunday

NNE wind 10 to 15 kt, with gusts as high as 25 kt. Partly 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. Mostly sunny. Waves 1 ft or less.

Monday Night

S wind 10 to 15 kt becoming WSW after midnight. Winds could gust as high as 25 kt. A chance of snow. Waves 1 ft or less.

Tuesday

W wind 10 to 15 kt becoming NNW in the afternoon. Winds could gust as high as 25 kt. Mostly sunny. Waves 1 ft or less.

Tuesday Night

N wind 10 to 15 kt, with gusts as high as 20 kt. A slight chance of snow. Waves 1 ft or less.

Note...Wave height forecasts are for ice free areas.

*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.