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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Overnight
Low: 18 °F
NE 10kt
1ft
Wednesday
High: 26 °F
ENE 10kt
< 1ft

Small Craft Advisory
Wednesday Night
Low: 23 °F
ENE 15kt
1-3ft

Small Craft Advisory
Thursday
High: 30 °F
ENE 25kt
4-6ft
Thursday Night
Low: 26 °F
ENE 25kt⇓
5ft
Friday
High: 34 °F
N 10kt
1-2ft
Friday Night
Low: 27 °F
ENE 25kt
4ft
Saturday
High: 32 °F
NE 20kt
3-5ft
Saturday Night
Low: 25 °F
N 20kt
1-3ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 11:52 pm CDT Mar 31, 2026
Forecast Valid: 12am CDT Apr 1, 2026-6pm CDT Apr 7, 2026

View Nearby Observations

Detailed Forecast

Overnight

NE wind around 10 kt, with gusts as high as 15 kt. A slight chance of snow between 1am and 4am. Waves around 1 ft.

Wednesday

ENE wind around 10 kt. Increasing clouds. Waves 1 ft or less.

Wednesday Night

ENE wind 10 to 15 kt, with gusts as high as 20 kt. A slight chance of snow after 4am. Waves 1 to 3 ft.

Thursday

ENE wind 20 to 25 kt, with gusts as high as 40 kt. Snow showers, mainly after 7am. The snow could be heavy at times. Widespread freezing spray after 11am. Waves 4 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, possibly mixed with sleet, becoming all snow after 10pm. Waves 5 ft subsiding to 2 ft.

Friday

N wind around 10 kt becoming NE in the afternoon. Winds could gust as high as 25 kt. A slight chance of snow. Waves 1 to 2 ft.

Friday Night

ENE wind 15 to 25 kt, with gusts as high as 35 kt. Snow likely, mainly after 1am. Waves 1 ft building to 4 ft.

Saturday

NE wind around 20 kt, with gusts as high as 30 kt. Snow. The snow could be heavy at times. Waves 3 to 5 ft.

Saturday Night

N wind around 20 kt, with gusts as high as 30 kt. A chance of snow. Waves 1 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.