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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Late Afternoon
High: 29 °F
N 10kt
< 1ft
Tonight
Low: 14 °F
WNW 10kt
< 1ft
Tuesday
High: 32 °F
SW 10kt
< 1ft
Tuesday Night
Low: 27 °F
S 15kt
1-2ft
Wednesday
High: 39 °F
SE 15kt
3-4ft
Wednesday Night
Low: 33 °F
SSE 15kt
3-5ft
Thursday
High: 39 °F
W 15kt
3-4ft
Thursday Night
Low: 30 °F
Light Wind
1-2ft
Friday
High: 40 °F
Light Wind
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 3:22 pm CDT Apr 6, 2026
Forecast Valid: 4pm CDT Apr 6, 2026-6pm CDT Apr 13, 2026

View Nearby Observations

Detailed Forecast

Late Afternoon

N wind around 10 kt, with gusts as high as 15 kt. A chance of flurries. Waves 1 ft or less.

Tonight

WNW wind 5 to 10 kt, with gusts as high as 20 kt. Mostly clear. Waves 1 ft or less.

Tuesday

W wind 5 to 10 kt becoming SW in the afternoon. Winds could gust as high as 15 kt. Sunny. Waves 1 ft or less.

Tuesday Night

SW wind 5 to 15 kt becoming SSE in the evening. A chance of flurries before 11pm, then a chance of snow. Waves 1 to 2 ft.

Wednesday

SE wind around 15 kt, with gusts as high as 20 kt. Rain, possibly mixed with snow, becoming all rain after 4pm. Waves 3 to 4 ft.

Wednesday Night

SSE wind 10 to 15 kt becoming WSW in the evening. Winds could gust as high as 30 kt. A chance of rain before 4am, then a slight chance of snow. Waves 3 to 5 ft.

Thursday

W wind 10 to 15 kt, with gusts as high as 30 kt. A slight chance of snow before 7am. Waves 3 to 4 ft.

Thursday Night

Variable winds 5 kt or less. Mostly cloudy. Waves 1 to 2 ft.

Friday

Variable winds 5 kt or less. Partly 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.