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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 25 °F
E 10kt
1ft

Small Craft Advisory
Tonight
Low: 27 °F
ENE 15kt
1-2ft

Small Craft Advisory
Thursday
High: 30 °F
⇑ENE 25kt
6ft

Gale Warning
Thursday Night
Low: 28 °F
ENE 25kt⇓
6ft

Gale Warning
Friday
High: 34 °F
ENE 15kt
1-2ft
Friday Night
Low: 29 °F
ENE 20kt
1-3ft
Saturday
High: 32 °F
NE 20kt
3-4ft
Saturday Night
Low: 26 °F
N 20kt
1-2ft
Sunday
High: 38 °F
NNW 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: 2:01 pm CDT Apr 1, 2026
Forecast Valid: 3pm CDT Apr 1, 2026-6pm CDT Apr 8, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

E wind around 10 kt, with gusts as high as 20 kt. Partly sunny. Waves around 1 ft.

Tonight

ENE wind 10 to 15 kt, with gusts as high as 20 kt. A slight chance of snow showers, mainly between 4am and 5am. Waves 1 to 2 ft.

Thursday

ENE wind 15 to 20 kt increasing to 20 to 25 kt in the afternoon. Winds could gust as high as 35 kt. Snow showers, mainly after noon. The snow could be heavy at times. Widespread freezing spray after 1pm. Waves 3 ft building to 6 ft.

Thursday Night

ENE wind 20 to 25 kt becoming N 15 to 20 kt after midnight. Winds could gust as high as 45 kt. Snow showers before 10pm, then snow showers, possibly mixed with sleet between 10pm and 11pm, then snow showers after 11pm. Waves 6 ft subsiding to 3 ft.

Friday

N wind 10 to 15 kt becoming ENE in the afternoon. Winds could gust as high as 25 kt. A slight chance of snow showers before 1pm. Waves 1 to 2 ft.

Friday Night

ENE wind 15 to 20 kt, with gusts as high as 35 kt. Snow showers, possibly mixed with sleet, becoming all snow after 4am. Waves 1 to 3 ft.

Saturday

NE wind 15 to 20 kt, with gusts as high as 35 kt. Snow. Waves 3 to 4 ft.

Saturday Night

N wind 15 to 20 kt, with gusts as high as 30 kt. A chance of snow. Waves 1 to 2 ft.

Sunday

NNW wind 10 to 15 kt becoming W in the afternoon. Winds could gust as high as 30 kt. 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.