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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tonight
Low: 47 °F
S 15kt
4ft

Small Craft Advisory
Friday
High: 61 °F
SW 15kt
3-4ft

Small Craft Advisory
Friday Night
Low: 47 °F
W 15kt
1-3ft

Small Craft Advisory
Saturday
High: 59 °F
W 10kt
1ft
Saturday Night
Low: 39 °F
Light Wind
< 1ft
Sunday
High: 49 °F
⇑ENE 20kt
3ft
Sunday Night
Low: 41 °F
ENE 20kt
3-4ft
Monday
High: 54 °F
ESE 15kt
3-4ft
Monday Night
Low: 42 °F
NNE 20kt
1-2ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 4:06 pm CDT May 14, 2026
Forecast Valid: 4pm CDT May 14, 2026-6pm CDT May 21, 2026

View Nearby Observations

Detailed Forecast

Tonight

E wind 10 to 15 kt becoming SSW after midnight. Showers and thunderstorms before 3am, then a chance of showers. Waves 1 ft building to 4 ft.

Friday

SW wind 10 to 15 kt, with gusts as high as 25 kt. Mostly cloudy, then gradually becoming sunny. Waves 3 to 4 ft.

Friday Night

W wind 10 to 15 kt, with gusts as high as 25 kt. Mostly clear. Waves 1 to 3 ft.

Saturday

W wind around 10 kt, with gusts as high as 20 kt. Sunny. Waves around 1 ft.

Saturday Night

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

Sunday

ENE wind 10 to 15 kt increasing to 15 to 20 kt in the afternoon. Winds could gust as high as 30 kt. A chance of showers after 1pm. Waves 1 ft or less building to 3 ft.

Sunday Night

ENE wind 15 to 20 kt, with gusts as high as 35 kt. Showers and possibly a thunderstorm. Waves 3 to 4 ft.

Monday

NE wind 10 to 15 kt becoming S in the afternoon. Showers, with thunderstorms also possible after 1pm. Waves 3 to 4 ft.

Monday Night

NNE wind 10 to 20 kt, with gusts as high as 35 kt. Showers. Waves 1 to 2 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.