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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tuesday
High: 23 °F
ENE 10kt
< 1ft
Tuesday Night
Low: 24 °F
ENE 10kt
1ft
Wednesday
High: 32 °F
N 10kt
1ft
Wednesday Night
Low: 21 °F
Light Wind
< 1ft
Thursday
High: 29 °F
⇑SE 10kt
< 1ft
Thursday Night
Low: 16 °F
E 20kt
6ft
Friday
High: 30 °F
NE 20kt
6ft
Friday Night
Low: 23 °F
NNW 10kt
1-2ft
Saturday
High: 27 °F
ESE 10kt
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 12:26 am CDT Mar 10, 2026
Forecast Valid: 1am CDT Mar 10, 2026-6pm CDT Mar 16, 2026

View Nearby Observations

Detailed Forecast

Tuesday

ENE wind around 10 kt, with gusts as high as 20 kt. A slight chance of snow before 7am. Waves 1 ft or less.

Tuesday Night

ENE wind 5 to 10 kt, with gusts as high as 20 kt. A chance of snow, mainly between 1am and 2am. Waves around 1 ft.

Wednesday

N wind 5 to 10 kt. A chance of snow, mainly between 8am and 1pm, then a chance for flurries. Waves around 1 ft.

Wednesday Night

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

Thursday

Variable winds less than 5 kt becoming SE 5 to 10 kt in the afternoon. A chance of flurries after 1pm. Waves 1 ft or less.

Thursday Night

E wind 15 to 20 kt, with gusts as high as 25 kt. Snow likely. The snow could be heavy at times. Waves 2 ft building to 6 ft.

Friday

NE wind 15 to 20 kt becoming NW in the afternoon. Winds could gust as high as 30 kt. A chance of snow before 1pm. Widespread freezing spray before 10am. Waves 6 ft subsiding to 3 ft.

Friday Night

NNW wind 5 to 10 kt, with gusts as high as 20 kt. Mostly cloudy. Waves 1 to 2 ft.

Saturday

NNW wind 5 to 10 kt becoming ESE in the afternoon. 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.