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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Monday
High: 70 °F
ENE 10kt
1-2ft

Small Craft Advisory
Monday Night
Low: 59 °F
Light Wind
< 1ft
Tuesday
High: 73 °F
SW 15kt
1-2ft
Tuesday Night
Low: 59 °F
WNW 10kt
< 1ft
Wednesday
High: 69 °F
Light Wind
< 1ft
Wednesday Night
Low: 57 °F
Light Wind
< 1ft
Thursday
High: 67 °F
E 10kt
< 1ft
Thursday Night
Low: 57 °F
Light Wind
< 1ft
Friday
High: 67 °F
ENE 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: 2:51 am CDT Aug 31, 2026
Forecast Valid: 4am CDT Aug 31, 2026-6pm CDT Sep 6, 2026

View Nearby Observations

Detailed Forecast

Monday

ENE wind 5 to 10 kt becoming ESE in the afternoon. Showers and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms between 10am and 11am. Areas of dense fog. Waves 1 to 2 ft.

Monday Night

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

Tuesday

SW wind 5 to 15 kt, with gusts as high as 20 kt. Mostly sunny. Waves 1 to 2 ft.

Tuesday Night

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

Wednesday

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

Wednesday Night

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

Thursday

NNE wind 5 to 10 kt becoming E in the afternoon. Mostly sunny. Waves 1 ft or less.

Thursday Night

Variable winds 5 kt or less. A slight chance of showers. Waves 1 ft or less.

Friday

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