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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 66 °F
SW 10kt
1ft

Small Craft Advisory
Tonight
Low: 52 °F
SW 15kt
1-3ft

Small Craft Advisory
Saturday
High: 70 °F
SW 10kt
1-2ft

Small Craft Advisory
Saturday Night
Low: 50 °F
Light Wind
< 1ft
Sunday
High: 69 °F
Light Wind
< 1ft
Sunday Night
Low: 51 °F
Light Wind
< 1ft
Monday
High: 68 °F
Light Wind
< 1ft
Monday Night
Low: 51 °F
Light Wind
< 1ft
Tuesday
High: 67 °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: 2:11 pm CDT Jul 24, 2026
Forecast Valid: 2pm CDT Jul 24, 2026-6pm CDT Jul 30, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

SW wind 5 to 10 kt, with gusts as high as 20 kt. A slight chance of showers after 3pm. Waves around 1 ft.

Tonight

SW wind 10 to 15 kt, with gusts as high as 25 kt. Showers and thunderstorms before 2am, then showers likely and possibly a thunderstorm between 2am and 3am, then a chance of showers and thunderstorms after 3am. Waves 1 to 3 ft.

Saturday

SW wind around 10 kt, with gusts as high as 15 kt. A slight chance of showers and thunderstorms before 7am. Waves 1 to 2 ft.

Saturday Night

Variable winds 5 kt or less. A chance of showers after 4am. Waves 1 ft or less.

Sunday

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

Sunday Night

Variable winds 5 kt or less. A chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Waves 1 ft or less.

Monday

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

Monday Night

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

Tuesday

Variable winds 5 kt or less. A slight chance of showers. 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.