For More Weather Information:

Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tonight
Low: 54 °F
Light Wind
< 1ft

Small Craft Advisory
Thursday
High: 69 °F
SW 15kt
1-2ft
Thursday Night
Low: 53 °F
WSW 10kt
1-2ft
Friday
High: 68 °F
SW 20kt
2-3ft
Friday Night
Low: 54 °F
SW 15kt
2-4ft
Saturday
High: 72 °F
WSW 15kt
2-3ft
Saturday Night
Low: 50 °F
Light Wind
< 1ft
Sunday
High: 66 °F
Light Wind
< 1ft
Sunday Night
Low: 51 °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: 9:36 pm CDT Jul 22, 2026
Forecast Valid: 9pm CDT Jul 22, 2026-6pm CDT Jul 29, 2026

View Nearby Observations

Detailed Forecast

Tonight

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

Thursday

SW wind 10 to 15 kt, with gusts as high as 20 kt. A slight chance of showers and thunderstorms after 2pm. Waves 1 to 2 ft.

Thursday Night

WSW wind around 10 kt, with gusts as high as 20 kt. A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 11pm. Waves 1 to 2 ft.

Friday

SW wind 10 to 20 kt, with gusts as high as 25 kt. Mostly sunny. Waves 2 to 3 ft.

Friday Night

SW wind 10 to 15 kt, with gusts as high as 30 kt. A chance of showers and thunderstorms before 1am, then showers and possibly a thunderstorm between 1am and 4am, then showers after 4am. Waves 2 to 4 ft.

Saturday

WSW wind 10 to 15 kt, with gusts as high as 25 kt. A slight chance of showers before 1pm. Waves 2 to 3 ft.

Saturday Night

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

Sunday

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

Sunday Night

Variable winds 5 kt or less. A chance of showers and thunderstorms, 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.