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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Today
High: 44 °F
Light Wind
2ft
Tonight
Low: 38 °F
W 10kt
1-2ft
Monday
High: 40 °F
Light Wind
< 1ft
Monday Night
Low: 35 °F
NE 10kt
< 1ft
Tuesday
High: 38 °F
NE 10kt
1ft
Tuesday Night
Low: 35 °F
Light Wind
< 1ft
Wednesday
High: 41 °F
ENE 10kt
< 1ft
Wednesday Night
Low: 36 °F
Light Wind
< 1ft
Thursday
High: 47 °F
ESE 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: 11:31 am CDT Apr 12, 2026
Forecast Valid: 11am CDT Apr 12, 2026-6pm CDT Apr 18, 2026

View Nearby Observations

Detailed Forecast

Today

Variable winds 5 kt or less. A chance of showers before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Patchy fog before 2pm. Waves around 2 ft.

Tonight

SSE wind 5 to 10 kt becoming WNW after midnight. Winds could gust as high as 15 kt. A chance of showers and thunderstorms before midnight, then a slight chance of showers between midnight and 1am. Waves 1 to 2 ft.

Monday

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

Monday Night

NE wind 5 to 10 kt, with gusts as high as 20 kt. Showers likely, mainly before 1am. Waves 1 ft or less.

Tuesday

NE wind 5 to 10 kt. A slight chance of rain before 1pm. Waves around 1 ft.

Tuesday Night

Variable winds 5 kt or less. A slight chance of rain after 1am. Waves 1 ft or less.

Wednesday

ENE wind 5 to 10 kt. A chance of rain, mainly after 1pm. Waves 1 ft or less.

Wednesday Night

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

Thursday

NNE wind 5 to 10 kt becoming SE in the afternoon. A slight chance of rain. 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.