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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tonight
Low: 52 °F
SW 10kt
< 1ft

Small Craft Advisory
Monday
High: 72 °F
SW 20kt
2-4ft

Small Craft Advisory
Monday Night
Low: 55 °F
NW 15kt
1-2ft

Small Craft Advisory
Tuesday
High: 66 °F
N 20kt
1ft
Tuesday Night
Low: 48 °F
NW 10kt
< 1ft
Wednesday
High: 66 °F
WSW 10kt
< 1ft
Wednesday Night
Low: 51 °F
W 10kt
< 1ft
Thursday
High: 68 °F
WSW 10kt
< 1ft
Thursday Night
Low: 50 °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: 8:06 pm CDT Jul 19, 2026
Forecast Valid: 8pm CDT Jul 19, 2026-6pm CDT Jul 26, 2026

View Nearby Observations

Detailed Forecast

Tonight

S wind 5 to 10 kt becoming WSW after midnight. A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Patchy smoke. Waves 1 ft or less.

Monday

SW wind 15 to 20 kt, with gusts as high as 25 kt. A chance of showers and thunderstorms, mainly after 3pm. Waves 2 to 4 ft.

Monday Night

W wind 10 to 15 kt becoming NW after midnight. Winds could gust as high as 20 kt. A chance of showers and thunderstorms, mainly before 7pm. Waves 1 to 2 ft.

Tuesday

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

Tuesday Night

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

Wednesday

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

Thursday Night

Variable winds 5 kt or less. 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.