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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Today
High: 39 °F
Light Wind
< 1ft
Tonight
Low: 38 °F
Light Wind
< 1ft
Thursday
High: 37 °F
Light Wind
< 1ft
Thursday Night
Low: 36 °F
NE 10kt
< 1ft
Friday
High: 38 °F
ENE 15kt
1-2ft
Friday Night
Low: 31 °F
NNW 15kt
1-3ft
Saturday
High: 34 °F
WNW 15kt
1ft
Saturday Night
Low: 23 °F
NW 15kt
1ft
Sunday
High: 35 °F
NW 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: 8:02 am CDT Apr 15, 2026
Forecast Valid: 9am CDT Apr 15, 2026-6pm CDT Apr 21, 2026

View Nearby Observations

Detailed Forecast

Today

Variable winds 5 kt or less. Patchy dense fog after 2pm. Waves 1 ft or less.

Tonight

Variable winds 5 kt or less. Areas of dense fog before 4am, then Areas of dense fog after 5am. Waves 1 ft or less.

Thursday

Variable winds 5 kt or less. Widespread dense fog, mainly before 7am, then Patchy dense fog between 10am and 3pm. Waves 1 ft or less.

Thursday Night

NE wind 5 to 10 kt, with gusts as high as 15 kt. Mostly cloudy. Waves 1 ft or less.

Friday

ENE wind 10 to 15 kt, with gusts as high as 20 kt. A chance of rain between 1pm and 4pm, then a chance of rain and thunderstorms after 4pm. Waves 1 to 2 ft.

Friday Night

NNE wind around 15 kt becoming NNW after midnight. Winds could gust as high as 30 kt. Rain and possibly a thunderstorm before 1am, then a chance of rain. Waves 1 to 3 ft.

Saturday

WNW wind around 15 kt, with gusts as high as 30 kt. A chance of rain and snow. Waves around 1 ft.

Saturday Night

NW wind around 15 kt, with gusts as high as 30 kt. A chance of snow, mainly before 1am. Waves around 1 ft.

Sunday

NW wind 10 to 15 kt, with gusts as high as 30 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.