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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 45 °F
ENE 20kt
3ft

Small Craft Advisory
Tonight
Low: 40 °F
ENE 15kt
3-4ft

Small Craft Advisory
Monday
High: 50 °F
NNE 10kt
2-3ft

Small Craft Advisory
Monday Night
Low: 38 °F
NE 15kt
1-3ft
Tuesday
High: 43 °F
N 15kt
1-3ft
Tuesday Night
Low: 34 °F
NW 10kt
< 1ft
Wednesday
High: 46 °F
SSW 10kt
< 1ft
Wednesday Night
Low: 37 °F
Light Wind
< 1ft
Thursday
High: 50 °F
SE 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: 1:22 pm CDT May 17, 2026
Forecast Valid: 1pm CDT May 17, 2026-6pm CDT May 23, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

ENE wind 15 to 20 kt, with gusts as high as 25 kt. Partly sunny. Waves around 3 ft.

Tonight

ENE wind around 15 kt, with gusts as high as 30 kt. Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Waves 3 to 4 ft.

Monday

NNE wind around 10 kt, with gusts as high as 20 kt. A chance of showers and thunderstorms before 11am, then a slight chance of showers between 11am and noon. Waves 2 to 3 ft.

Monday Night

NE wind 10 to 15 kt, with gusts as high as 30 kt. Showers after 1am. Waves 1 to 3 ft.

Tuesday

N wind 10 to 15 kt becoming NW in the afternoon. Winds could gust as high as 25 kt. Showers likely before 1pm. Waves 1 to 3 ft.

Tuesday Night

NW wind 5 to 10 kt, with gusts as high as 15 kt. Mostly cloudy. Waves 1 ft or less.

Wednesday

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

Wednesday Night

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

Thursday

SSW wind 5 to 10 kt becoming SE in the afternoon. Mostly sunny. 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.