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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tonight
Low: 42 °F
Light Wind
< 1ft
Monday
High: 56 °F
ENE 15kt
1-2ft
Monday Night
Low: 43 °F
NE 10kt
< 1ft
Tuesday
High: 58 °F
Light Wind
< 1ft
Tuesday Night
Low: 45 °F
Light Wind
< 1ft
Wednesday
High: 64 °F
SW 10kt
< 1ft
Wednesday Night
Low: 47 °F
Light Wind
< 1ft
Thursday
High: 61 °F
SW 10kt
1ft
Thursday Night
Low: 45 °F
WSW 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: 4:26 pm CDT May 31, 2026
Forecast Valid: 5pm CDT May 31, 2026-6pm CDT Jun 7, 2026

View Nearby Observations

Detailed Forecast

Tonight

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

Monday

ENE wind 5 to 15 kt. Sunny. Waves 1 to 2 ft.

Monday Night

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

Tuesday

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

Tuesday Night

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

Wednesday

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

Wednesday Night

Variable winds 5 kt or less. A chance of showers and thunderstorms after 1am. Waves 1 ft or less.

Thursday

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

Thursday Night

WSW wind 5 to 10 kt becoming NW after midnight. Winds could gust as high as 15 kt. A chance of showers and thunderstorms before 1am, then 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.