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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 61 °F
Light Wind
< 1ft
Tonight
Low: 45 °F
Light Wind
< 1ft
Saturday
High: 60 °F
Light Wind
< 1ft
Saturday Night
Low: 45 °F
NE 10kt
< 1ft
Sunday
High: 60 °F
ENE 15kt
1ft
Sunday Night
Low: 47 °F
ENE 15kt
2-3ft
Monday
High: 65 °F
ENE 10kt
2ft
Monday Night
Low: 50 °F
NE 10kt
1-2ft
Tuesday
High: 70 °F
SW 10kt
1-2ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 12:21 pm CDT Jun 26, 2026
Forecast Valid: 12pm CDT Jun 26, 2026-6pm CDT Jul 2, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

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

Tonight

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

Saturday

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

Saturday Night

NE wind 5 to 10 kt. Mostly cloudy. Waves 1 ft or less.

Sunday

ENE wind 5 to 15 kt, with gusts as high as 20 kt. A chance of showers after 1pm. Waves around 1 ft.

Sunday Night

ENE wind 5 to 15 kt, with gusts as high as 20 kt. A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Waves 2 to 3 ft.

Monday

ENE wind 5 to 10 kt, with gusts as high as 15 kt. A chance of showers, with thunderstorms also possible after 1pm. Waves around 2 ft.

Monday Night

NE wind 5 to 10 kt, with gusts as high as 20 kt. Showers likely and possibly a thunderstorm. Waves 1 to 2 ft.

Tuesday

SW wind 5 to 10 kt. A slight chance of showers, with thunderstorms also possible after 1pm. Waves 1 to 2 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.