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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tonight
Low: 53 °F
ENE 15kt
1-2ft

Small Craft Advisory
Tuesday
High: 71 °F
SSW 10kt
1-2ft
Tuesday Night
Low: 50 °F
WSW 10kt
< 1ft
Wednesday
High: 70 °F
SW 10kt
< 1ft
Wednesday Night
Low: 50 °F
WSW 10kt
< 1ft
Thursday
High: 71 °F
SW 10kt
< 1ft
Thursday Night
Low: 50 °F
Light Wind
< 1ft
Friday
High: 67 °F
Light Wind
< 1ft
Friday Night
Low: 48 °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: 6:21 pm CDT Jun 29, 2026
Forecast Valid: 7pm CDT Jun 29, 2026-6pm CDT Jul 6, 2026

View Nearby Observations

Detailed Forecast

Tonight

ENE wind 5 to 15 kt becoming SE after midnight. Winds could gust as high as 20 kt. A chance of showers and thunderstorms. Some of the storms could be severe. Patchy dense fog between 9pm and 10pm, then Patchy dense fog between 2am and 4am, then Patchy dense fog after 5am. Waves 1 to 2 ft.

Tuesday

WSW wind 5 to 10 kt becoming SSW in the morning. Winds could gust as high as 15 kt. A slight chance of showers before 7am. Waves 1 to 2 ft.

Tuesday Night

WSW wind 5 to 10 kt, with gusts as high as 20 kt. Mostly cloudy. Waves 1 ft or less.

Wednesday

SW wind 5 to 10 kt, with gusts as high as 20 kt. A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Waves 1 ft or less.

Wednesday Night

WSW wind 5 to 10 kt. A chance of showers and thunderstorms before 1am. Waves 1 ft or less.

Thursday

SW wind 5 to 10 kt, with gusts as high as 15 kt. Mostly sunny. Waves 1 ft or less.

Thursday Night

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

Friday

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

Friday Night

Variable winds 5 kt or less. A chance of showers, mainly before 1am. 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.