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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Today
High: 59 °F
Light Wind
< 1ft
Tonight
Low: 48 °F
Light Wind
< 1ft
Tuesday
High: 60 °F
Light Wind
< 1ft
Tuesday Night
Low: 47 °F
⇑E 10kt
< 1ft
Wednesday
High: 61 °F
ENE 10kt
1ft
Wednesday Night
Low: 48 °F
ESE 10kt
1-2ft
Thursday
High: 63 °F
SW 20kt
5ft
Thursday Night
Low: 46 °F
WSW 15kt
2-4ft
Friday
High: 59 °F
WSW 20kt
2-4ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 10:36 am CDT Jun 8, 2026
Forecast Valid: 11am CDT Jun 8, 2026-6pm CDT Jun 14, 2026

View Nearby Observations

Detailed Forecast

Today

Variable winds 5 kt or less. A chance of showers, mainly before 1pm. Waves 1 ft or less.

Tonight

Variable winds 5 kt or less. A chance of showers, mainly before 1am. Patchy fog after 2am. Waves 1 ft or less.

Tuesday

Variable winds 5 kt or less. Areas of dense fog before 8am, then Patchy dense fog between 9am and 10am, then Patchy dense fog between 11am and noon. Waves 1 ft or less.

Tuesday Night

Variable winds less than 5 kt becoming E 5 to 10 kt in the evening. Patchy dense fog after 9pm. Waves 1 ft or less.

Wednesday

ENE wind around 10 kt, with gusts as high as 15 kt. A chance of showers, then showers and possibly a thunderstorm after 1pm. Patchy fog before 8am. Waves around 1 ft.

Wednesday Night

ENE wind 5 to 10 kt becoming WSW after midnight. Winds could gust as high as 20 kt. Showers likely and possibly a thunderstorm before 10pm, then showers likely between 10pm and 1am. Waves 1 to 2 ft.

Thursday

SW wind 15 to 20 kt, with gusts as high as 30 kt. A chance of showers, mainly after 1pm. Waves 2 ft building to 5 ft.

Thursday Night

WSW wind 10 to 15 kt, with gusts as high as 25 kt. Partly cloudy. Waves 2 to 4 ft.

Friday

WSW wind 15 to 20 kt, with gusts as high as 30 kt. Mostly sunny. Waves 2 to 4 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.