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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Monday
High: 39 °F
⇑SSW 15kt
3ft

Small Craft Advisory
Monday Night
Low: 38 °F
W 10kt
2-3ft

Small Craft Advisory
Tuesday
High: 47 °F
Light Wind
< 1ft
Tuesday Night
Low: 35 °F
Light Wind
< 1ft
Wednesday
High: 47 °F
Light Wind
< 1ft
Wednesday Night
Low: 40 °F
ENE 10kt
1-3ft
Thursday
High: 49 °F
ENE 15kt
3-4ft
Thursday Night
Low: 43 °F
E 15kt
7ft
Friday
High: 47 °F
SE 20kt
5-7ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 2:16 am CDT Apr 20, 2026
Forecast Valid: 2am CDT Apr 20, 2026-6pm CDT Apr 26, 2026

View Nearby Observations

Detailed Forecast

Monday

Variable winds less than 5 kt becoming SSW 10 to 15 kt in the morning. Winds could gust as high as 20 kt. Increasing clouds. Waves 1 ft or less building to 3 ft.

Monday Night

W wind 5 to 10 kt, with gusts as high as 20 kt. Partly cloudy. Waves 2 to 3 ft.

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

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

Wednesday Night

ENE wind around 10 kt. A chance of showers after 1am. Waves 1 to 3 ft.

Thursday

ENE wind 10 to 15 kt. A chance of showers after 1pm. Waves 3 to 4 ft.

Thursday Night

E wind around 15 kt, with gusts as high as 20 kt. Rain and possibly a thunderstorm. Waves 4 ft building to 7 ft.

Friday

ESE wind 15 to 20 kt becoming WSW in the afternoon. A chance of rain, mainly before 1pm. Waves 5 to 7 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.