For More Weather Information:

Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Today
High: 62 °F
SW 20kt
3-4ft

Small Craft Advisory
Tonight
Low: 48 °F
W 15kt
4ft

Small Craft Advisory
Saturday
High: 60 °F
W 15kt
1ft
Saturday Night
Low: 39 °F
Light Wind
< 1ft
Sunday
High: 46 °F
⇑ENE 20kt
3ft
Sunday Night
Low: 41 °F
NE 20kt
4-5ft
Monday
High: 53 °F
ENE 15kt
3-4ft
Monday Night
Low: 40 °F
NE 25kt
2-3ft
Tuesday
High: 47 °F
NNE 25kt
2-3ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 4:16 am CDT May 15, 2026
Forecast Valid: 7am CDT May 15, 2026-6pm CDT May 21, 2026

View Nearby Observations

Detailed Forecast

Today

SW wind 10 to 20 kt, with gusts as high as 25 kt. Sunny. Waves 3 to 4 ft.

Tonight

W wind 10 to 15 kt, with gusts as high as 25 kt. Clear. Waves 4 ft subsiding to 1 ft.

Saturday

W wind 10 to 15 kt, with gusts as high as 25 kt. Sunny. Waves around 1 ft.

Saturday Night

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

Sunday

ENE wind 10 to 15 kt increasing to 15 to 20 kt in the afternoon. Winds could gust as high as 30 kt. Showers likely and possibly a thunderstorm, mainly after 4pm. Waves 1 ft or less building to 3 ft.

Sunday Night

NE wind 15 to 20 kt, with gusts as high as 35 kt. Showers and possibly a thunderstorm. Waves 4 to 5 ft.

Monday

ENE wind 10 to 15 kt, with gusts as high as 20 kt. A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Waves 3 to 4 ft.

Monday Night

NE wind 15 to 25 kt, with gusts as high as 45 kt. Showers likely and possibly a thunderstorm, then showers after 1am. Waves 2 to 3 ft.

Tuesday

NNE wind 20 to 25 kt becoming NNW in the afternoon. Winds could gust as high as 40 kt. Showers. Waves 2 to 3 ft.

*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.