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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 65 °F
Light Wind
< 1ft
Tonight
Low: 57 °F
Light Wind
< 1ft
Sunday
High: 64 °F
ENE 15kt
< 1ft

Small Craft Advisory
Sunday Night
Low: 58 °F
ENE 10kt
1ft

Small Craft Advisory
Monday
High: 67 °F
ENE 10kt
2ft
Monday Night
Low: 58 °F
Light Wind
1ft
Tuesday
High: 71 °F
SW 15kt
< 1ft
Tuesday Night
Low: 58 °F
Light Wind
< 1ft
Wednesday
High: 70 °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: 1:21 pm CDT Aug 29, 2026
Forecast Valid: 1pm CDT Aug 29, 2026-6pm CDT Sep 4, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

Variable winds 5 kt or less. A slight chance of showers after 2pm. Waves 1 ft or less.

Tonight

Variable winds 5 kt or less. Patchy fog after midnight. Waves 1 ft or less.

Sunday

ENE wind 10 to 15 kt, with gusts as high as 20 kt. Patchy fog before 9am. Waves 1 ft or less.

Sunday Night

ENE wind around 10 kt, with gusts as high as 20 kt. A chance of showers, then showers likely and possibly a thunderstorm after 4am. Waves around 1 ft.

Monday

ENE wind 5 to 10 kt. Showers likely and possibly a thunderstorm before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Waves around 2 ft.

Monday Night

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

Tuesday

SW wind 5 to 15 kt, with gusts as high as 20 kt. Mostly sunny. Waves 1 ft or less.

Tuesday Night

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

Wednesday

Variable winds 5 kt or less. Partly sunny. 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.