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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tonight
Low: 46 °F
W 10kt
< 1ft
Saturday
High: 68 °F
NNW 10kt
< 1ft
Saturday Night
Low: 50 °F
Light Wind
< 1ft
Sunday
High: 69 °F
SSW 10kt
< 1ft
Sunday Night
Low: 52 °F
SW 10kt
< 1ft
Monday
High: 73 °F
SW 15kt
1-3ft
Monday Night
Low: 51 °F
WNW 15kt
1ft
Tuesday
High: 67 °F
NW 20kt
< 1ft
Tuesday Night
Low: 49 °F
NNW 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: 10:27 pm CDT Jul 17, 2026
Forecast Valid: 10pm CDT Jul 17, 2026-6pm CDT Jul 24, 2026

View Nearby Observations

Detailed Forecast

Tonight

SW wind 5 to 10 kt becoming WNW after midnight. Winds could gust as high as 20 kt. A slight chance of showers between 1am and 2am. Widespread smoke, mainly before midnight. Waves 1 ft or less.

Saturday

NNW wind 5 to 10 kt becoming SSW in the afternoon. Winds could gust as high as 20 kt. Widespread smoke, mainly after 8am. Waves 1 ft or less.

Saturday Night

Variable winds 5 kt or less. Areas of smoke. Waves 1 ft or less.

Sunday

SSW wind 5 to 10 kt. Areas of smoke before 8am. Waves 1 ft or less.

Sunday Night

SW wind 5 to 10 kt, with gusts as high as 15 kt. A chance of showers and thunderstorms after 1am. Waves 1 ft or less.

Monday

SW wind 10 to 15 kt, with gusts as high as 25 kt. A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Waves 1 to 3 ft.

Monday Night

WNW wind 10 to 15 kt, with gusts as high as 25 kt. A chance of showers before 1am. Waves around 1 ft.

Tuesday

NW wind 15 to 20 kt, with gusts as high as 30 kt. A slight chance of showers. Waves 1 ft or less.

Tuesday Night

NNW wind 10 to 15 kt, with gusts as high as 20 kt. Partly cloudy. 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.