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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Today
High: 38 °F
Light Wind
< 1ft
Tonight
Low: 36 °F
SE 10kt
1-2ft
Sunday
High: 47 °F
SE 10kt
2-3ft
Sunday Night
Low: 40 °F
Light Wind
1-2ft
Monday
High: 44 °F
Light Wind
< 1ft
Monday Night
Low: 36 °F
ENE 10kt
< 1ft
Tuesday
High: 40 °F
ENE 10kt
1ft
Tuesday Night
Low: 37 °F
NE 10kt
1ft
Wednesday
High: 45 °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: 7:22 am CDT Apr 11, 2026
Forecast Valid: 8am CDT Apr 11, 2026-6pm CDT Apr 17, 2026

View Nearby Observations

Detailed Forecast

Today

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

Tonight

ENE wind 5 to 10 kt becoming SE after midnight. Winds could gust as high as 20 kt. Showers. Waves 1 to 2 ft.

Sunday

SE wind 5 to 10 kt becoming E in the afternoon. Winds could gust as high as 15 kt. Showers likely, with thunderstorms also possible after 1pm. Waves 2 to 3 ft.

Sunday Night

Variable winds 5 kt or less. Winds could gust as high as 15 kt. A chance of showers and thunderstorms before 7pm, then a chance of showers between 7pm and 1am. Waves 1 to 2 ft.

Monday

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

Monday Night

ENE wind 5 to 10 kt, with gusts as high as 15 kt. Showers likely, mainly after 1am. Waves 1 ft or less.

Tuesday

ENE wind around 10 kt, with gusts as high as 15 kt. A chance of showers. Waves around 1 ft.

Tuesday Night

NE wind 5 to 10 kt, with gusts as high as 15 kt. A chance of showers. Waves around 1 ft.

Wednesday

Variable winds 5 kt or less. A chance of showers. Waves around 1 ft.

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.