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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Today
High: 68 °F
SW 15kt
1-2ft

Small Craft Advisory
Tonight
Low: 55 °F
SW 10kt
< 1ft

Small Craft Advisory
Tuesday
High: 66 °F
W 10kt
< 1ft
Tuesday Night
Low: 52 °F
W 10kt
< 1ft
Wednesday
High: 64 °F
SW 10kt
< 1ft
Wednesday Night
Low: 50 °F
Light Wind
< 1ft
Thursday
High: 65 °F
⇑S 10kt
< 1ft
Thursday Night
Low: 55 °F
Light Wind
< 1ft
Friday
High: 68 °F
WSW 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: 3:31 am CDT Aug 17, 2026
Forecast Valid: 5am CDT Aug 17, 2026-6pm CDT Aug 23, 2026

View Nearby Observations

Detailed Forecast

Today

SW wind 5 to 15 kt. Mostly sunny. Waves 1 to 2 ft.

Tonight

SW wind 5 to 10 kt becoming WNW after midnight. Winds could gust as high as 15 kt. Showers and thunderstorms likely, mainly before 10pm. Waves 1 ft or less.

Tuesday

W wind 5 to 10 kt, with gusts as high as 20 kt. Mostly sunny. Waves 1 ft or less.

Tuesday Night

W wind 5 to 10 kt becoming NW after midnight. Partly cloudy. Waves 1 ft or less.

Wednesday

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

Wednesday Night

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

Thursday

Variable winds less than 5 kt becoming S 5 to 10 kt in the afternoon. Mostly sunny. Waves 1 ft or less.

Thursday Night

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

Friday

WSW wind 5 to 10 kt, with gusts as high as 20 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.