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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Today
High: 39 °F
Light Wind
< 1ft
Tonight
Low: 36 °F
NE 10kt
< 1ft
Friday
High: 47 °F
ENE 10kt
1ft
Friday Night
Low: 28 °F
WNW 15kt
1-2ft
Saturday
High: 32 °F
WNW 20kt
1ft
Saturday Night
Low: 24 °F
NW 15kt
< 1ft
Sunday
High: 35 °F
NW 10kt
< 1ft
Sunday Night
Low: 27 °F
Light Wind
< 1ft
Monday
High: 42 °F
S 10kt
1-2ft

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 16, 2026
Forecast Valid: 5am CDT Apr 16, 2026-6pm CDT Apr 22, 2026

View Nearby Observations

Detailed Forecast

Today

Variable winds 5 kt or less. Widespread dense fog, mainly between 7am and 8am. Waves 1 ft or less.

Tonight

NE wind 5 to 10 kt. A slight chance of rain after 3am. Patchy fog before 10pm, then Patchy fog between 11pm and 2am. Waves 1 ft or less.

Friday

ENE wind around 10 kt, with gusts as high as 15 kt. Rain and possibly a thunderstorm, mainly after 4pm. Areas of dense fog between 8am and 11am. Waves around 1 ft.

Friday Night

WNW wind 10 to 15 kt, with gusts as high as 25 kt. Rain likely and possibly a thunderstorm before 10pm, then rain likely between 10pm and 1am. Waves 1 to 2 ft.

Saturday

WNW wind 15 to 20 kt, with gusts as high as 25 kt. Partly sunny. Waves around 1 ft.

Saturday Night

NW wind around 15 kt, with gusts as high as 30 kt. Mostly cloudy. Waves 1 ft or less.

Sunday

NW wind around 10 kt, with gusts as high as 25 kt. Mostly sunny. Waves 1 ft or less.

Sunday Night

Variable winds 5 kt or less. Mostly clear. Waves 1 ft or less.

Monday

S wind 5 to 10 kt. Mostly sunny. Waves 1 to 2 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.