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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Overnight
Low: 34 °F
W 10kt
< 1ft

Small Craft Advisory
Tuesday
High: 43 °F
W 10kt
< 1ft
Tuesday Night
Low: 32 °F
WNW 10kt
< 1ft
Wednesday
High: 42 °F
WSW 10kt
< 1ft
Wednesday Night
Low: 34 °F
Light Wind
< 1ft
Thursday
High: 42 °F
SW 10kt
< 1ft
Thursday Night
Low: 34 °F
Light Wind
< 1ft
Friday
High: 45 °F
WSW 10kt
< 1ft
Friday Night
Low: 35 °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: 9:27 pm CDT May 4, 2026
Forecast Valid: 11pm CDT May 4, 2026-6pm CDT May 11, 2026

View Nearby Observations

Detailed Forecast

Overnight

W wind around 10 kt, with gusts as high as 20 kt. A chance of rain showers before 1am, then a chance of sprinkles and flurries after 2am. Waves 1 ft or less.

Tuesday

W wind around 10 kt, with gusts as high as 20 kt. A chance of rain and snow showers before 2pm, then a slight chance of rain showers between 2pm and 4pm, then a slight chance of snow showers after 4pm. Waves 1 ft or less.

Tuesday Night

WNW wind 5 to 10 kt, with gusts as high as 15 kt. A chance of rain showers before 11pm, then a chance of sprinkles and flurries between 11pm and midnight. Waves 1 ft or less.

Wednesday

NW wind 5 to 10 kt becoming WSW in the afternoon. Increasing clouds. Waves 1 ft or less.

Wednesday Night

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

Thursday

WNW wind 5 to 10 kt becoming SW in the afternoon. Partly sunny. Waves 1 ft or less.

Thursday Night

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

Friday

NW wind 5 to 10 kt becoming WSW in the afternoon. Mostly sunny. Waves 1 ft or less.

Friday Night

Variable winds 5 kt or less. Partly cloudy. 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.