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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Monday
High: 73 °F
SW 20kt
2-4ft

Small Craft Advisory
Monday Night
Low: 53 °F
W 15kt
1-2ft

Small Craft Advisory
Tuesday
High: 60 °F
N 20kt
< 1ft
Tuesday Night
Low: 49 °F
NW 10kt
< 1ft
Wednesday
High: 66 °F
WSW 10kt
< 1ft
Wednesday Night
Low: 51 °F
W 10kt
< 1ft
Thursday
High: 69 °F
WSW 10kt
< 1ft
Thursday Night
Low: 52 °F
Light Wind
< 1ft
Friday
High: 63 °F
SSE 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 am CDT Jul 20, 2026
Forecast Valid: 2am CDT Jul 20, 2026-6pm CDT Jul 26, 2026

View Nearby Observations

Detailed Forecast

Monday

SW wind 15 to 20 kt, with gusts as high as 30 kt. Showers and thunderstorms likely, mainly before 3pm, then showers likely and possibly a thunderstorm after 4pm. Waves 2 to 4 ft.

Monday Night

W wind 10 to 15 kt, with gusts as high as 25 kt. Showers likely and possibly a thunderstorm before 7pm. Patchy smoke before 9pm. Waves 1 to 2 ft.

Tuesday

N wind 15 to 20 kt, with gusts as high as 30 kt. Partly sunny. Waves 1 ft or less.

Tuesday Night

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

Wednesday

NW wind 5 to 10 kt becoming WSW in the afternoon. Winds could gust as high as 15 kt. Sunny. Waves 1 ft or less.

Wednesday Night

W wind 5 to 10 kt. Partly cloudy. Waves 1 ft or less.

Thursday

WSW wind 5 to 10 kt, with gusts as high as 20 kt. A slight chance of showers and thunderstorms after 1pm. Waves 1 ft or less.

Thursday Night

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

Friday

N wind 5 to 10 kt becoming S in the afternoon. A slight chance of showers. 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.