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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tuesday
High: 34 °F
ESE 10kt
< 1ft
Tuesday Night
Low: 25 °F
NE 10kt
< 1ft
Wednesday
High: 34 °F
ENE 10kt
< 1ft
Wednesday Night
Low: 25 °F
NE 10kt
< 1ft
Thursday
High: 30 °F
N 10kt
1ft
Thursday Night
Low: 10 °F
N 10kt
< 1ft
Friday
High: 27 °F
W 10kt
< 1ft
Friday Night
Low: 17 °F
WNW 10kt
< 1ft
Saturday
High: 33 °F
WNW 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: 3:31 am CDT Mar 24, 2026
Forecast Valid: 4am CDT Mar 24, 2026-6pm CDT Mar 30, 2026

View Nearby Observations

Detailed Forecast

Tuesday

W wind 5 to 10 kt becoming ESE in the afternoon. Winds could gust as high as 15 kt. A chance of flurries before 7am. Waves 1 ft or less.

Tuesday Night

NE wind around 10 kt. A slight chance of snow after 1am. Waves 1 ft or less.

Wednesday

ENE wind around 10 kt. A chance of snow before 10am, then a chance of rain and snow between 10am and noon, then a chance of snow after noon. Patchy fog before 9am. Waves 1 ft or less.

Wednesday Night

NE wind 5 to 10 kt. A chance of snow before 1am, then a chance of snow after 4am. Patchy fog after 4am. Waves 1 ft or less.

Thursday

N wind around 10 kt, with gusts as high as 20 kt. A chance of snow, mainly before 7am. Patchy fog before 7am. Waves around 1 ft.

Thursday Night

N wind around 10 kt, with gusts as high as 20 kt. Partly cloudy. Waves 1 ft or less.

Friday

NNW wind 5 to 10 kt becoming W in the afternoon. Winds could gust as high as 20 kt. Mostly sunny. Waves 1 ft or less.

Friday Night

WNW wind around 10 kt, with gusts as high as 20 kt. Mostly clear. Waves 1 ft or less.

Saturday

WNW wind around 10 kt, with gusts as high as 20 kt. Sunny. Waves 1 ft or less.

Note...Wave height forecasts are for ice free areas.

*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.