For More Weather Information:

Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 61 °F
Light Wind
< 1ft
Tonight
Low: 46 °F
ENE 10kt
1ft
Sunday
High: 60 °F
ENE 15kt
1ft
Sunday Night
Low: 46 °F
ENE 15kt
2-3ft
Monday
High: 62 °F
ENE 15kt
1-2ft
Monday Night
Low: 49 °F
ENE 15kt
1-2ft
Tuesday
High: 69 °F
SW 10kt
1-2ft
Tuesday Night
Low: 50 °F
WSW 10kt
1ft
Wednesday
High: 70 °F
SW 10kt
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 1:56 pm CDT Jun 27, 2026
Forecast Valid: 2pm CDT Jun 27, 2026-6pm CDT Jul 3, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

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

Tonight

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

Sunday

ENE wind 5 to 15 kt, with gusts as high as 20 kt. Partly sunny. Waves around 1 ft.

Sunday Night

ENE wind 5 to 15 kt, with gusts as high as 20 kt. Showers and thunderstorms before 3am, then showers and possibly a thunderstorm between 3am and 4am, then a chance of showers and thunderstorms after 4am. Waves 2 to 3 ft.

Monday

ENE wind 5 to 15 kt. A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Waves 1 to 2 ft.

Monday Night

ENE wind 5 to 15 kt becoming W after midnight. Winds could gust as high as 20 kt. Showers and possibly a thunderstorm. Waves 1 to 2 ft.

Tuesday

SW wind 5 to 10 kt, with gusts as high as 15 kt. A slight chance of thunderstorms before 7am, then a slight chance of showers and thunderstorms after 1pm. Waves 1 to 2 ft.

Tuesday Night

WSW wind 5 to 10 kt. A chance of showers, mainly before 1am. Waves around 1 ft.

Wednesday

SW wind 5 to 10 kt, with gusts as high as 15 kt. A slight chance of showers. 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.