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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Today
High: 34 °F
SW 15kt
2-3ft

Small Craft Advisory
Tonight
Low: 26 °F
Light Wind
< 1ft
Thursday
High: 34 °F
Light Wind
< 1ft
Thursday Night
Low: 31 °F
ESE 10kt
< 1ft
Friday
High: 38 °F
Light Wind
< 1ft
Friday Night
Low: 32 °F
Light Wind
1-2ft
Saturday
High: 36 °F
NNE 10kt
2ft
Saturday Night
Low: 22 °F
NNE 15kt
1-2ft
Sunday
High: 30 °F
NNE 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: 4:23 am CDT Mar 18, 2026
Forecast Valid: 6am CDT Mar 18, 2026-6pm CDT Mar 24, 2026

View Nearby Observations

Detailed Forecast

Today

SW wind 10 to 15 kt, with gusts as high as 20 kt. A chance of snow, mainly before 10am. Waves 2 to 3 ft.

Tonight

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

Thursday

Variable winds 5 kt or less. Partly sunny. Waves 1 ft or less.

Thursday Night

SSW wind 5 to 10 kt becoming ESE after midnight. A chance of snow before 10pm, then a chance of rain and snow between 10pm and 4am, then a slight chance of rain after 4am. Waves 1 ft or less.

Friday

Variable winds 5 kt or less. A slight chance of rain. Waves 1 ft or less.

Friday Night

Variable winds 5 kt or less. Winds could gust as high as 15 kt. Mostly cloudy. Waves 1 to 2 ft.

Saturday

WNW wind 5 to 10 kt becoming NNE in the afternoon. Winds could gust as high as 15 kt. A chance of rain and snow before 1pm, then a chance of snow. Waves around 2 ft.

Saturday Night

NNE wind 10 to 15 kt, with gusts as high as 25 kt. A chance of snow. Waves 1 to 2 ft.

Sunday

NNE wind around 10 kt, with gusts as high as 25 kt. A slight chance of snow. Waves around 1 ft.

*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.