For More Weather Information:

Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Friday
High: 64 °F
Light Wind
< 1ft
Friday Night
Low: 52 °F
Light Wind
< 1ft
Saturday
High: 63 °F
ENE 10kt
< 1ft
Saturday Night
Low: 53 °F
NE 10kt
1ft
Sunday
High: 68 °F
NW 10kt
< 1ft
Sunday Night
Low: 53 °F
Light Wind
< 1ft
Monday
High: 67 °F
SW 10kt
< 1ft
Monday Night
Low: 54 °F
SW 10kt
< 1ft
Tuesday
High: 66 °F
W 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: 2:52 am CDT Aug 14, 2026
Forecast Valid: 3am CDT Aug 14, 2026-6pm CDT Aug 20, 2026

View Nearby Observations

Detailed Forecast

Friday

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

Friday Night

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

Saturday

ENE wind 5 to 10 kt. Showers likely, with thunderstorms also possible after 4pm. Waves 1 ft or less.

Saturday Night

NE wind 5 to 10 kt becoming WNW after midnight. Winds could gust as high as 15 kt. Showers and thunderstorms likely before 10pm, then showers likely between 10pm and 1am. Waves around 1 ft.

Sunday

NW wind 5 to 10 kt. Mostly sunny. Waves 1 ft or less.

Sunday Night

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

Monday

WNW wind 5 to 10 kt becoming SW in the afternoon. Winds could gust as high as 20 kt. Mostly sunny. Waves 1 ft or less.

Monday Night

SW wind 5 to 10 kt. A slight chance of showers and thunderstorms, then a chance of showers after 1am. Waves 1 ft or less.

Tuesday

W wind 5 to 10 kt. A 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.