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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Today
High: 34 °F
NW 10kt
< 1ft

Small Craft Advisory
Tonight
Low: 25 °F
NW 10kt
< 1ft
Monday
High: 39 °F
⇑SSW 15kt
3ft
Monday Night
Low: 35 °F
SSW 15kt
2-3ft
Tuesday
High: 47 °F
Light Wind
< 1ft
Tuesday Night
Low: 36 °F
Light Wind
< 1ft
Wednesday
High: 47 °F
SE 10kt
< 1ft
Wednesday Night
Low: 40 °F
ENE 10kt
4ft
Thursday
High: 49 °F
ENE 15kt
4-5ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 5:12 am CDT Apr 19, 2026
Forecast Valid: 8am CDT Apr 19, 2026-6pm CDT Apr 25, 2026

View Nearby Observations

Detailed Forecast

Today

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

Tonight

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

Monday

WSW wind 5 to 10 kt becoming SSW 10 to 15 kt in the afternoon. Winds could gust as high as 20 kt. Increasing clouds. Waves 1 ft or less building to 3 ft.

Monday Night

SSW wind 10 to 15 kt becoming W after midnight. Winds could gust as high as 25 kt. Mostly cloudy during the early evening, then gradual clearing. Waves 2 to 3 ft.

Tuesday

Variable winds 5 kt or less. Sunny. Waves 1 ft or less.

Tuesday Night

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

Wednesday

SE wind 5 to 10 kt. Sunny. Waves 1 ft or less.

Wednesday Night

ENE wind around 10 kt, with gusts as high as 20 kt. A chance of rain. Waves 1 ft building to 4 ft.

Thursday

ENE wind 10 to 15 kt. A chance of rain. Waves 4 to 5 ft.

*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.