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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 62 °F
Light Wind
< 1ft
Tonight
Low: 59 °F
E 10kt
< 1ft
Wednesday
High: 69 °F
NW 10kt
< 1ft
Wednesday Night
Low: 56 °F
NW 10kt
< 1ft
Thursday
High: 65 °F
Light Wind
< 1ft
Thursday Night
Low: 50 °F
Light Wind
< 1ft
Friday
High: 62 °F
⇑S 10kt
< 1ft
Friday Night
Low: 53 °F
Light Wind
< 1ft
Saturday
High: 66 °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: 1:21 pm CDT Aug 25, 2026
Forecast Valid: 2pm CDT Aug 25, 2026-6pm CDT Aug 31, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

Variable winds 5 kt or less. Showers and possibly a thunderstorm, mainly before 4pm, then a chance of showers and thunderstorms after 4pm. Waves 1 ft or less.

Tonight

E wind 5 to 10 kt becoming W after midnight. Showers and thunderstorms likely, mainly before 1am. Patchy fog after midnight. Waves 1 ft or less.

Wednesday

NW wind 5 to 10 kt. A slight chance of showers, mainly between 3pm and 4pm. Waves 1 ft or less.

Wednesday Night

NW wind 5 to 10 kt. Partly cloudy. 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.

Friday

Variable winds less than 5 kt becoming S 5 to 10 kt in the afternoon. Sunny. Waves 1 ft or less.

Friday Night

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

Saturday

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.