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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Saturday
High: 57 °F
W 15kt
1-2ft
Saturday Night
Low: 38 °F
WNW 10kt
< 1ft
Sunday
High: 45 °F
E 20kt
4ft
Sunday Night
Low: 40 °F
E 20kt
4-5ft
Monday
High: 51 °F
NNW 15kt
2-3ft
Monday Night
Low: 37 °F
NNW 25kt
2-3ft
Tuesday
High: 43 °F
N 25kt
2-3ft
Tuesday Night
Low: 34 °F
N 10kt
< 1ft
Wednesday
High: 44 °F
W 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: 4:47 am CDT May 16, 2026
Forecast Valid: 4am CDT May 16, 2026-6pm CDT May 22, 2026

View Nearby Observations

Detailed Forecast

Saturday

W wind 10 to 15 kt, with gusts as high as 20 kt. Sunny. Waves 1 to 2 ft.

Saturday Night

WNW wind 5 to 10 kt becoming SW after midnight. Mostly clear. Waves 1 ft or less.

Sunday

E wind 10 to 20 kt, with gusts as high as 30 kt. A chance of showers, mainly after 3pm. Waves 1 ft building to 4 ft.

Sunday Night

ENE wind around 20 kt becoming SW after midnight. Winds could gust as high as 30 kt. Showers and possibly a thunderstorm. Waves 4 to 5 ft.

Monday

NNW wind 10 to 15 kt, with gusts as high as 20 kt. Showers likely, with thunderstorms also possible after 10am. Waves 2 to 3 ft.

Monday Night

NNW wind 15 to 25 kt, with gusts as high as 30 kt. Showers and possibly a thunderstorm. Waves 2 to 3 ft.

Tuesday

N wind 20 to 25 kt becoming W in the afternoon. Winds could gust as high as 35 kt. Showers likely, mainly before 1pm. Waves 2 to 3 ft.

Tuesday Night

N wind around 10 kt, with gusts as high as 20 kt. A slight chance of rain showers before 1am, then a slight chance of rain and snow showers between 1am and 4am, then a slight chance of snow showers after 4am. Waves 1 ft or less.

Wednesday

NNW wind around 10 kt becoming W in the afternoon. Winds could gust as high as 20 kt. Partly sunny. 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.