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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 63 °F
Light Wind
< 1ft
Tonight
Low: 57 °F
SW 10kt
1-2ft

Small Craft Advisory
Tuesday
High: 61 °F
WSW 15kt
2-3ft

Small Craft Advisory
Tuesday Night
Low: 49 °F
WNW 10kt
< 1ft
Wednesday
High: 64 °F
SW 15kt
< 1ft
Wednesday Night
Low: 50 °F
Light Wind
< 1ft
Thursday
High: 67 °F
SW 15kt
< 1ft
Thursday Night
Low: 52 °F
Light Wind
< 1ft
Friday
High: 69 °F
SW 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: 2:11 pm CDT Aug 3, 2026
Forecast Valid: 3pm CDT Aug 3, 2026-6pm CDT Aug 10, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

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

Tonight

E wind 5 to 10 kt becoming SW after midnight. Winds could gust as high as 20 kt. A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Waves 1 to 2 ft.

Tuesday

WSW wind 10 to 15 kt. A chance of showers, mainly before 7am. Waves 2 to 3 ft.

Tuesday Night

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

Wednesday

W wind 5 to 15 kt becoming SW in the afternoon. Sunny. Waves 1 ft or less.

Wednesday Night

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

Thursday

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

Thursday Night

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

Friday

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