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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 40 °F
Light Wind
< 1ft
Tonight
Low: 22 °F
N 10kt
< 1ft

Small Craft Advisory
Monday
High: 27 °F
N 15kt
< 1ft

Small Craft Advisory
Monday Night
Low: 15 °F
NW 10kt
< 1ft
Tuesday
High: 31 °F
SW 10kt
< 1ft
Tuesday Night
Low: 27 °F
SSE 15kt
1-2ft
Wednesday
High: 38 °F
SE 20kt
3-4ft
Wednesday Night
Low: 35 °F
S 20kt
2-4ft
Thursday
High: 39 °F
WSW 15kt
1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 1:21 pm CDT Apr 5, 2026
Forecast Valid: 2pm CDT Apr 5, 2026-6pm CDT Apr 11, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

Variable winds 5 kt or less. A slight chance of snow showers after 3pm. Waves 1 ft or less.

Tonight

WNW wind 5 to 10 kt becoming N after midnight. Winds could gust as high as 20 kt. A chance of snow showers, mainly after 2am. Waves 1 ft or less.

Monday

N wind 10 to 15 kt, with gusts as high as 30 kt. A chance of snow showers before 1pm, then a slight chance of snow showers after 3pm. Waves 1 ft or less.

Monday Night

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

Tuesday

WNW 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 after midnight. A chance of snow showers after 1am. Waves 1 to 2 ft.

Wednesday

SSE wind 15 to 20 kt becoming E in the afternoon. Rain, possibly mixed with snow. Waves 3 to 4 ft.

Wednesday Night

E wind 15 to 20 kt becoming WSW after midnight. Winds could gust as high as 25 kt. Rain likely before 1am, then a slight chance of rain and snow. Waves 2 to 4 ft.

Thursday

WSW wind 10 to 15 kt, with gusts as high as 25 kt. Partly sunny. Waves around 1 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.