For More Weather Information:

Grand Portage MN

[NOTICE]

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Last Update: 9:11 pm CDT Oct 7, 2026
Forecast Valid: 11pm CDT Oct 7, 2026-6pm CDT Oct 14, 2026

Overnight

W wind around 10 km/h, with gusts as high as 30 km/h. Mostly clear. Waves 1 m or less.

Thursday

WNW wind 10 to 20 km/h, with gusts as high as 35 km/h. Mostly sunny. Waves 1 m or less.

Thursday Night

WNW wind 5 to 10 km/h. Mostly cloudy. Waves 1 m or less.

Friday

W wind 5 to 10 km/h becoming SE in the afternoon. Increasing clouds. Waves 1 m or less.

Friday Night

E wind around 10 km/h, with gusts as high as 35 km/h. Mostly cloudy. Waves 1 m or less.

Saturday

ESE wind 10 to 20 km/h becoming S in the afternoon. Winds could gust as high as 35 km/h. Mostly sunny. Waves 1 m or less.

Saturday Night

SW wind 20 to 25 km/h, with gusts as high as 50 km/h. Mostly clear. Waves 1 m or less.

Sunday

SW wind 15 to 20 km/h, with gusts as high as 40 km/h. A slight chance of showers. Waves 1 m or less.

Sunday Night

N wind 15 to 20 km/h, with gusts as high as 35 km/h. Showers likely. Waves 1 m 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.