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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Late Afternoon
High: 38 °F
Light Wind
3ft
Tonight
Low: 36 °F
WSW 15kt
2ft

Small Craft Advisory
Thursday
High: 38 °F
W 15kt
1-3ft

Small Craft Advisory
Thursday Night
Low: 28 °F
Light Wind
< 1ft
Friday
High: 39 °F
WSW 10kt
< 1ft
Friday Night
Low: 30 °F
Light Wind
< 1ft
Saturday
High: 41 °F
Light Wind
< 1ft
Saturday Night
Low: 36 °F
E 15kt
3ft
Sunday
High: 46 °F
ESE 15kt
3ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 3:42 pm CDT Apr 8, 2026
Forecast Valid: 5pm CDT Apr 8, 2026-6pm CDT Apr 15, 2026

View Nearby Observations

Detailed Forecast

Late Afternoon

Variable winds 5 kt or less. Showers. Waves around 3 ft.

Tonight

WSW wind 5 to 15 kt, with gusts as high as 25 kt. A chance of rain showers, mixing with snow after midnight, then gradually ending. Waves around 2 ft.

Thursday

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

Thursday Night

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

Friday

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

Friday Night

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

Saturday

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

Saturday Night

E wind 5 to 15 kt. Rain. Waves 1 ft or less building to 3 ft.

Sunday

ESE wind 10 to 15 kt. Rain, with thunderstorms also possible after 1pm. Waves around 3 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.