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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tonight
Low: 56 °F
Light Wind
< 1ft
Monday
High: 67 °F
SW 15kt
1-2ft

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

Small Craft Advisory
Tuesday
High: 65 °F
W 10kt
< 1ft
Tuesday Night
Low: 50 °F
NW 10kt
< 1ft
Wednesday
High: 64 °F
SW 10kt
< 1ft
Wednesday Night
Low: 50 °F
Light Wind
< 1ft
Thursday
High: 65 °F
SSW 10kt
< 1ft
Thursday Night
Low: 54 °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: 9:12 pm CDT Aug 16, 2026
Forecast Valid: 10pm CDT Aug 16, 2026-6pm CDT Aug 23, 2026

View Nearby Observations

Detailed Forecast

Tonight

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

Monday

SW wind 5 to 15 kt, with gusts as high as 20 kt. Mostly sunny. Waves 1 to 2 ft.

Monday Night

SW wind 5 to 10 kt becoming W after midnight. Winds could gust as high as 15 kt. A slight chance of showers and thunderstorms, then a chance of showers after 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

NW wind 5 to 10 kt. 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

NNW wind 5 to 10 kt becoming S in the morning. Mostly sunny. Waves 1 ft or less.

Thursday Night

Variable winds 5 kt or less. A slight chance of showers, then a chance of showers and thunderstorms after 1am. 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.