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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 56 °F
ENE 10kt
1ft

Small Craft Advisory
Tonight
Low: 46 °F
ENE 10kt
1-2ft

Small Craft Advisory
Monday
High: 56 °F
ENE 10kt
1-2ft
Monday Night
Low: 48 °F
Light Wind
< 1ft
Tuesday
High: 60 °F
Light Wind
< 1ft
Tuesday Night
Low: 47 °F
Light Wind
< 1ft
Wednesday
High: 64 °F
ENE 10kt
< 1ft
Wednesday Night
Low: 48 °F
ESE 10kt
1-2ft
Thursday
High: 63 °F
SW 25kt
3-5ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 12:36 pm CDT Jun 7, 2026
Forecast Valid: 1pm CDT Jun 7, 2026-6pm CDT Jun 13, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

ENE wind around 10 kt, with gusts as high as 15 kt. Sunny. Waves around 1 ft.

Tonight

ENE wind 5 to 10 kt, with gusts as high as 20 kt. Increasing clouds. Waves 1 to 2 ft.

Monday

ENE wind 5 to 10 kt. Showers and possibly a thunderstorm. Waves 1 to 2 ft.

Monday Night

Variable winds 5 kt or less. Showers likely and possibly a thunderstorm before 2am, then a slight chance of showers between 2am and 3am. Waves 1 ft or less.

Tuesday

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

Tuesday Night

Variable winds 5 kt or less. A chance of showers and thunderstorms after 1am. Waves 1 ft or less.

Wednesday

ENE wind 5 to 10 kt. A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Waves 1 ft or less.

Wednesday Night

ENE wind around 10 kt becoming WSW after midnight. Winds could gust as high as 15 kt. Showers and possibly a thunderstorm before 1am, then a chance of showers. Waves 1 to 2 ft.

Thursday

SW wind 15 to 25 kt, with gusts as high as 30 kt. A chance of showers. Waves 3 to 5 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.