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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 45 °F
NE 15kt
2ft

Small Craft Advisory
Tonight
Low: 40 °F
WNW 15kt
2-3ft

Small Craft Advisory
Tuesday
High: 46 °F
WNW 15kt
1-2ft
Tuesday Night
Low: 35 °F
NW 10kt
< 1ft
Wednesday
High: 41 °F
Light Wind
< 1ft
Wednesday Night
Low: 32 °F
Light Wind
< 1ft
Thursday
High: 40 °F
Light Wind
< 1ft
Thursday Night
Low: 31 °F
Light Wind
< 1ft
Friday
High: 42 °F
S 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: 1:21 pm CDT Apr 27, 2026
Forecast Valid: 2pm CDT Apr 27, 2026-6pm CDT May 3, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

NE wind 10 to 15 kt. Showers. Waves around 2 ft.

Tonight

ENE wind 10 to 15 kt becoming WNW after midnight. Winds could gust as high as 25 kt. Showers, mainly before 3am. Patchy fog between 1am and 2am. Waves 2 to 3 ft.

Tuesday

WNW wind around 15 kt, with gusts as high as 35 kt. A chance of showers, mainly before 9am. Waves 1 to 2 ft.

Tuesday Night

NW wind 5 to 10 kt, with gusts as high as 15 kt. Partly cloudy. Waves 1 ft or less.

Wednesday

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

Wednesday Night

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

Thursday

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

Thursday Night

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

Friday

NNW wind 5 to 10 kt becoming SSE in the afternoon. Mostly sunny. 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.