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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tonight
Low: 47 °F
Light Wind
< 1ft
Monday
High: 63 °F
Light Wind
< 1ft
Monday Night
Low: 50 °F
Light Wind
< 1ft
Tuesday
High: 68 °F
Light Wind
< 1ft
Tuesday Night
Low: 50 °F
Light Wind
< 1ft
Wednesday
High: 63 °F
Light Wind
< 1ft
Wednesday Night
Low: 49 °F
Light Wind
< 1ft
Thursday
High: 65 °F
Light Wind
< 1ft
Thursday 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: 5:07 pm CDT Jul 5, 2026
Forecast Valid: 6pm CDT Jul 5, 2026-6pm CDT Jul 12, 2026

View Nearby Observations

Detailed Forecast

Tonight

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

Monday

Variable winds 5 kt or less. Sunny. Waves 1 ft or less.

Monday Night

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

Tuesday

Variable winds 5 kt or less. A slight chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Waves 1 ft or less.

Tuesday Night

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

Wednesday

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

Wednesday Night

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

Thursday

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

Thursday Night

Variable winds 5 kt or less. Partly cloudy. 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.