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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Today
High: 66 °F
Light Wind
< 1ft
Tonight
Low: 56 °F
Light Wind
< 1ft
Friday
High: 61 °F
Light Wind
< 1ft
Friday Night
Low: 52 °F
Light Wind
< 1ft
Saturday
High: 70 °F
Light Wind
< 1ft
Saturday Night
Low: 52 °F
Light Wind
< 1ft
Sunday
High: 69 °F
SW 10kt
< 1ft
Sunday Night
Low: 53 °F
Light Wind
< 1ft
Monday
High: 67 °F
W 15kt
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 6:07 am CDT Jul 16, 2026
Forecast Valid: 6am CDT Jul 16, 2026-6pm CDT Jul 22, 2026

View Nearby Observations

Detailed Forecast

Today

Variable winds 5 kt or less. A slight chance of showers after 3pm. Widespread smoke. Waves 1 ft or less.

Tonight

Variable winds 5 kt or less. A slight chance of showers, then a chance of showers and thunderstorms after 4am. Widespread smoke. Waves 1 ft or less.

Friday

Variable winds 5 kt or less. Showers and thunderstorms before noon, then a chance of showers between noon and 1pm, then a chance of showers and thunderstorms after 1pm. Widespread smoke. Waves 1 ft or less.

Friday Night

Variable winds 5 kt or less. Showers likely and possibly a thunderstorm before 1am. Widespread smoke. Waves 1 ft or less.

Saturday

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

Saturday Night

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

Sunday

SW wind 5 to 10 kt. Partly sunny. Waves 1 ft or less.

Sunday Night

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

Monday

W wind 10 to 15 kt becoming N in the afternoon. Winds could gust as high as 20 kt. A chance of showers, then showers likely and possibly a thunderstorm after 1pm. 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.