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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Today
High: 61 °F
ENE 15kt
1-2ft

Small Craft Advisory
Tonight
Low: 47 °F
ENE 10kt
2-3ft

Small Craft Advisory
Monday
High: 64 °F
ENE 15kt
1-2ft
Monday Night
Low: 50 °F
NE 15kt
1-2ft
Tuesday
High: 69 °F
SW 10kt
1-2ft
Tuesday Night
Low: 50 °F
WSW 10kt
< 1ft
Wednesday
High: 69 °F
WSW 15kt
< 1ft
Wednesday Night
Low: 50 °F
WSW 10kt
< 1ft
Thursday
High: 68 °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: 4:41 am CDT Jun 28, 2026
Forecast Valid: 5am CDT Jun 28, 2026-6pm CDT Jul 4, 2026

View Nearby Observations

Detailed Forecast

Today

ENE wind 5 to 15 kt, with gusts as high as 20 kt. A chance of showers, mainly before 7am. Waves 1 to 2 ft.

Tonight

ENE wind 5 to 10 kt, with gusts as high as 20 kt. Showers and thunderstorms before 3am, then showers likely and possibly a thunderstorm between 3am and 4am, then a chance of showers and thunderstorms after 4am. Waves 2 to 3 ft.

Monday

ENE wind 5 to 15 kt. A chance of showers and thunderstorms before 4pm, then a chance of showers after 5pm. Waves 1 to 2 ft.

Monday Night

NE wind 5 to 15 kt, with gusts as high as 25 kt. Showers and thunderstorms before 4am, then a chance of showers. Waves 1 to 2 ft.

Tuesday

SW wind 5 to 10 kt. A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Waves 1 to 2 ft.

Tuesday Night

WSW wind around 10 kt, with gusts as high as 15 kt. A chance of showers and thunderstorms. Waves 1 ft or less.

Wednesday

WSW wind 10 to 15 kt. Mostly sunny. Waves 1 ft or less.

Wednesday Night

WSW wind 5 to 10 kt becoming NW after midnight. A chance of showers. Waves 1 ft or less.

Thursday

ENE wind 5 to 10 kt becoming SE in the afternoon. A slight chance of showers and thunderstorms after 1pm. Waves 1 ft or less.

*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.