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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tonight
Low: 44 °F
Light Wind
< 1ft
Friday
High: 63 °F
SW 10kt
< 1ft
Friday Night
Low: 44 °F
ENE 10kt
< 1ft
Saturday
High: 55 °F
ENE 15kt
1-2ft
Saturday Night
Low: 43 °F
NE 10kt⇓
1-2ft
Sunday
High: 62 °F
Light Wind
< 1ft
Sunday Night
Low: 46 °F
NNE 10kt
< 1ft
Monday
High: 58 °F
ENE 15kt
< 1ft
Monday Night
Low: 45 °F
Light Wind
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 5:16 pm CDT May 28, 2026
Forecast Valid: 5pm CDT May 28, 2026-6pm CDT Jun 4, 2026

View Nearby Observations

Detailed Forecast

Tonight

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

Friday

WSW wind 5 to 10 kt becoming E in the afternoon. A slight chance of showers between 3pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Waves 1 ft or less.

Friday Night

ENE wind 5 to 10 kt, with gusts as high as 20 kt. Mostly cloudy. Waves 1 ft or less.

Saturday

ENE wind 10 to 15 kt, with gusts as high as 20 kt. Mostly sunny. Waves 1 to 2 ft.

Saturday Night

NE wind 5 to 10 kt becoming variable and less than 5 kt after midnight. Winds could gust as high as 20 kt. Mostly clear. Waves 1 to 2 ft.

Sunday

Variable winds 5 kt or less. Sunny. Waves 1 ft or less.

Sunday Night

SW wind 5 to 10 kt becoming NNE after midnight. Winds could gust as high as 15 kt. Mostly clear. Waves 1 ft or less.

Monday

ENE wind 10 to 15 kt. Sunny. Waves 1 ft or less.

Monday Night

Variable winds 5 kt or less. Mostly clear. 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.