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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Overnight
Low: 52 °F
E 10kt
1-2ft
Tuesday
High: 71 °F
SW 10kt
1-2ft
Tuesday Night
Low: 50 °F
WSW 10kt
< 1ft
Wednesday
High: 70 °F
SW 10kt
< 1ft
Wednesday Night
Low: 50 °F
WSW 10kt
< 1ft
Thursday
High: 71 °F
SW 10kt
< 1ft
Thursday Night
Low: 50 °F
Light Wind
< 1ft
Friday
High: 67 °F
Light Wind
< 1ft
Friday Night
Low: 48 °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: 11:46 pm CDT Jun 29, 2026
Forecast Valid: 12am CDT Jun 30, 2026-6pm CDT Jul 6, 2026

View Nearby Observations

Detailed Forecast

Overnight

E wind 5 to 10 kt becoming SW. Showers likely and possibly a thunderstorm before 2am, then a chance of showers and thunderstorms between 2am and 4am. Some of the storms could be severe. Patchy dense fog before 1am, then Patchy dense fog after 2am. Waves 1 to 2 ft.

Tuesday

SW wind 5 to 10 kt, with gusts as high as 15 kt. Patchy dense fog before 9am. Waves 1 to 2 ft.

Tuesday Night

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

Wednesday

SW wind 5 to 10 kt, with gusts as high as 20 kt. A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Waves 1 ft or less.

Wednesday Night

WSW wind 5 to 10 kt. A chance of showers and thunderstorms before 1am. Waves 1 ft or less.

Thursday

SW wind 5 to 10 kt, with gusts as high as 15 kt. Mostly sunny. Waves 1 ft or less.

Thursday Night

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

Friday

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

Friday Night

Variable winds 5 kt or less. A chance of showers, mainly before 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.