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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 58 °F
Light Wind
1ft
Tonight
Low: 45 °F
Light Wind
< 1ft
Friday
High: 64 °F
Light Wind
< 1ft
Friday Night
Low: 47 °F
Light Wind
< 1ft
Saturday
High: 63 °F
Light Wind
< 1ft
Saturday Night
Low: 45 °F
Light Wind
< 1ft
Sunday
High: 59 °F
ENE 10kt
< 1ft
Sunday Night
Low: 45 °F
NE 10kt
1ft
Monday
High: 64 °F
ENE 10kt
1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 2:06 pm CDT Jun 4, 2026
Forecast Valid: 2pm CDT Jun 4, 2026-6pm CDT Jun 10, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

Variable winds 5 kt or less. A slight chance of showers and thunderstorms after 3pm. Waves around 1 ft.

Tonight

Variable winds 5 kt or less. A slight chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 3am. Waves 1 ft or less.

Friday

Variable winds 5 kt or less. Cloudy, then gradually becoming mostly sunny. Waves 1 ft or less.

Friday Night

Variable winds 5 kt or less. Mostly cloudy, then gradually becoming clear. Waves 1 ft or less.

Saturday

Variable winds 5 kt or less. Sunny. Waves 1 ft or less.

Saturday Night

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

Sunday

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

Sunday Night

NE wind 5 to 10 kt, with gusts as high as 20 kt. Partly cloudy. Waves around 1 ft.

Monday

ENE wind 5 to 10 kt. A slight chance of showers and thunderstorms after 1pm. Waves around 1 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.