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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tonight
Low: 37 °F
ENE 10kt
< 1ft
Friday
High: 49 °F
NE 10kt
2ft
Friday Night
Low: 28 °F
WNW 15kt
1-2ft
Saturday
High: 32 °F
WNW 20kt
1ft
Saturday Night
Low: 24 °F
NW 15kt
< 1ft
Sunday
High: 36 °F
NW 10kt
< 1ft
Sunday Night
Low: 27 °F
Light Wind
< 1ft
Monday
High: 41 °F
S 15kt
1-2ft
Monday Night
Low: 38 °F
SSW 15kt
2-3ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 9:02 pm CDT Apr 16, 2026
Forecast Valid: 9pm CDT Apr 16, 2026-6pm CDT Apr 23, 2026

View Nearby Observations

Detailed Forecast

Tonight

ENE wind 5 to 10 kt. A slight chance of showers after 3am. Waves 1 ft or less.

Friday

NE wind 5 to 10 kt. A chance of showers, then showers and possibly a thunderstorm after 4pm. Waves around 2 ft.

Friday Night

WNW wind 10 to 15 kt, with gusts as high as 25 kt. Rain showers and snow before 1am, then a slight chance of rain showers between 1am and 4am, then a slight chance of snow after 4am. Some thunder is also possible. Patchy fog before 8pm. Waves 1 to 2 ft.

Saturday

WNW wind 15 to 20 kt, with gusts as high as 30 kt. A slight chance of snow before 1pm. Waves around 1 ft.

Saturday Night

NW wind around 15 kt, with gusts as high as 30 kt. Mostly cloudy. Waves 1 ft or less.

Sunday

NW wind around 10 kt, with gusts as high as 20 kt. Mostly sunny. Waves 1 ft or less.

Sunday Night

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

Monday

S wind 5 to 15 kt. Mostly sunny. Waves 1 to 2 ft.

Monday Night

S wind around 15 kt becoming W after midnight. Winds could gust as high as 25 kt. Mostly cloudy. Waves 2 to 3 ft.

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.