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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Wednesday
High: 27 °F
ENE 10kt
< 1ft

Small Craft Advisory
Wednesday Night
Low: 26 °F
ENE 15kt
1-3ft

Small Craft Advisory
Thursday
High: 31 °F
ENE 25kt
4-6ft
Thursday Night
Low: 26 °F
ENE 25kt
6ft
Friday
High: 33 °F
N 15kt
1-2ft
Friday Night
Low: 28 °F
ENE 20kt
1-3ft
Saturday
High: 31 °F
NE 20kt
3-4ft
Saturday Night
Low: 26 °F
NNW 20kt
1-2ft
Sunday
High: 36 °F
NNW 20kt
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 1:51 am CDT Apr 1, 2026
Forecast Valid: 2am CDT Apr 1, 2026-6pm CDT Apr 7, 2026

View Nearby Observations

Detailed Forecast

Wednesday

ENE wind around 10 kt. Increasing clouds. Waves 1 ft or less.

Wednesday Night

ENE wind 10 to 15 kt, with gusts as high as 20 kt. A slight chance of snow after 4am. Waves 1 to 3 ft.

Thursday

ENE wind 20 to 25 kt, with gusts as high as 35 kt. Snow, mainly after 7am. The snow could be heavy at times. Widespread freezing spray after 1pm. Waves 4 to 6 ft.

Thursday Night

ENE wind 15 to 25 kt becoming N after midnight. Winds could gust as high as 40 kt. Snow and sleet, becoming all snow after 4am. Waves 6 ft subsiding to 3 ft.

Friday

N wind 10 to 15 kt becoming ENE in the afternoon. Winds could gust as high as 25 kt. A chance of snow. Waves 1 to 2 ft.

Friday Night

ENE wind 15 to 20 kt, with gusts as high as 40 kt. Snow likely, possibly mixed with sleet, becoming all snow after 4am. Waves 1 to 3 ft.

Saturday

NE wind around 20 kt, with gusts as high as 35 kt. Snow. Waves 3 to 4 ft.

Saturday Night

NNW wind 15 to 20 kt, with gusts as high as 35 kt. Snow likely. Waves 1 to 2 ft.

Sunday

NNW wind 10 to 20 kt becoming WNW in the afternoon. Winds could gust as high as 30 kt. 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.