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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Friday
High: 65 °F
Light Wind
< 1ft
Friday Night
Low: 52 °F
NW 10kt
< 1ft
Saturday
High: 67 °F
NNW 10kt
< 1ft
Saturday Night
Low: 55 °F
N 10kt
< 1ft
Sunday
High: 63 °F
N 10kt
< 1ft
Sunday Night
Low: 50 °F
Light Wind
< 1ft
Monday
High: 64 °F
Light Wind
< 1ft
Monday Night
Low: 50 °F
Light Wind
< 1ft
Tuesday
High: 66 °F
SSW 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: 12:01 am CDT Aug 21, 2026
Forecast Valid: 1am CDT Aug 21, 2026-6pm CDT Aug 27, 2026

View Nearby Observations

Detailed Forecast

Friday

Variable winds 5 kt or less. A chance of showers, mainly between 4pm and 5pm. Patchy dense fog before 7am, then Patchy dense fog between 9am and 10am. Waves 1 ft or less.

Friday Night

SW wind 5 to 10 kt becoming NNW after midnight. A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 1am. Waves 1 ft or less.

Saturday

NNW wind around 10 kt, with gusts as high as 20 kt. Mostly sunny. Waves 1 ft or less.

Saturday Night

N wind around 10 kt. Partly cloudy. Waves 1 ft or less.

Sunday

N wind 5 to 10 kt becoming SSE in the afternoon. Sunny. Waves 1 ft or less.

Sunday Night

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

Monday

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

Monday Night

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

Tuesday

SSW wind 5 to 10 kt, with gusts as high as 15 kt. A chance of showers, with thunderstorms also possible after 1pm. 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.