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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Thursday
High: 48 °F
ENE 15kt
3ft

Small Craft Advisory
Thursday Night
Low: 38 °F
NE 15kt
4ft

Small Craft Advisory
Friday
High: 43 °F
NE 15kt
3-5ft

Small Craft Advisory
Friday Night
Low: 41 °F
NW 10kt
1-3ft

Small Craft Advisory
Saturday
High: 48 °F
SW 10kt
1ft
Saturday Night
Low: 38 °F
Light Wind
< 1ft
Sunday
High: 46 °F
E 10kt
< 1ft
Sunday Night
Low: 37 °F
NE 10kt
< 1ft
Monday
High: 45 °F
ENE 15kt
4ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 11:06 pm CDT Apr 22, 2026
Forecast Valid: 1am CDT Apr 23, 2026-6pm CDT Apr 29, 2026

View Nearby Observations

Detailed Forecast

Thursday

ENE wind 10 to 15 kt. A chance of showers and thunderstorms after 5pm. Waves around 3 ft.

Thursday Night

NE wind 10 to 15 kt. Showers and thunderstorms before 4am, then showers and possibly a thunderstorm, mainly after 4am. Waves around 4 ft.

Friday

NE wind 10 to 15 kt becoming NNW in the morning. Showers and possibly a thunderstorm before 11am, then rain likely, mainly between 11am and 1pm. Waves 3 to 5 ft.

Friday Night

NW wind around 10 kt, with gusts as high as 15 kt. A chance of rain. Waves 1 to 3 ft.

Saturday

NW wind around 10 kt becoming SW in the afternoon. A slight chance of rain before 1pm. Waves around 1 ft.

Saturday Night

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

Sunday

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

Sunday Night

NE wind 5 to 10 kt, with gusts as high as 15 kt. A slight chance of rain. Waves 1 ft or less.

Monday

ENE wind 10 to 15 kt, with gusts as high as 25 kt. A chance of rain. Waves 1 ft building to 4 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.