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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Today
High: 69 °F
Light Wind
< 1ft
Tonight
Low: 53 °F
W 10kt
< 1ft
Saturday
High: 70 °F
NNW 10kt
< 1ft
Saturday Night
Low: 51 °F
Light Wind
< 1ft
Sunday
High: 68 °F
SSW 10kt
< 1ft
Sunday Night
Low: 52 °F
SW 10kt
< 1ft
Monday
High: 75 °F
WSW 15kt
1-2ft
Monday Night
Low: 52 °F
WNW 20kt
< 1ft
Tuesday
High: 67 °F
NNW 20kt
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 5:22 am CDT Jul 17, 2026
Forecast Valid: 7am CDT Jul 17, 2026-6pm CDT Jul 23, 2026

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Detailed Forecast

Today

Variable winds 5 kt or less. Showers and possibly a thunderstorm, mainly before 2pm, then a chance of showers and thunderstorms after 2pm. Widespread smoke, mainly between 3pm and 4pm. Waves 1 ft or less.

Tonight

ESE wind 5 to 10 kt becoming WNW after midnight. Winds could gust as high as 20 kt. A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 11pm. Areas of smoke before midnight, then Patchy smoke after 4am. 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 before 11am. Waves 1 ft or less.

Saturday Night

Variable winds 5 kt or less. Patchy smoke before 8pm. Waves 1 ft or less.

Sunday

SSW wind 5 to 10 kt. Mostly sunny. Waves 1 ft or less.

Sunday Night

SW wind 5 to 10 kt. Showers likely and possibly a thunderstorm after 1am. Waves 1 ft or less.

Monday

WSW wind 10 to 15 kt, with gusts as high as 25 kt. A chance of showers and thunderstorms, mainly after 1pm. Waves 1 to 2 ft.

Monday Night

WNW wind 15 to 20 kt, with gusts as high as 25 kt. A slight chance of showers and thunderstorms before 1am. Waves 1 ft or less.

Tuesday

NNW wind around 20 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.