For More Weather Information:

Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Today
High: 69 °F
SW 10kt
1ft
Tonight
Low: 51 °F
WSW 10kt
< 1ft
Thursday
High: 72 °F
WSW 15kt
1-2ft
Thursday Night
Low: 50 °F
W 10kt
< 1ft
Friday
High: 65 °F
Light Wind
< 1ft
Friday Night
Low: 48 °F
Light Wind
< 1ft
Independence Day
High: 64 °F
ENE 10kt
< 1ft
Saturday Night
Low: 49 °F
Light Wind
< 1ft
Sunday
High: 65 °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 am CDT Jul 1, 2026
Forecast Valid: 8am CDT Jul 1, 2026-6pm CDT Jul 7, 2026

View Nearby Observations

Detailed Forecast

Today

SW wind 5 to 10 kt, with gusts as high as 15 kt. A slight chance of showers between 1pm and 2pm, then a slight chance of showers and thunderstorms after 2pm. Waves around 1 ft.

Tonight

WSW wind 5 to 10 kt. A slight chance of showers and thunderstorms before 8pm. Waves 1 ft or less.

Thursday

WSW wind 10 to 15 kt. Sunny. Waves 1 to 2 ft.

Thursday Night

W wind 5 to 10 kt becoming NNE after midnight. Partly cloudy. Waves 1 ft or less.

Friday

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

Friday Night

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

Independence Day

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

Saturday Night

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

Sunday

Variable winds 5 kt or less. Mostly sunny. 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.