For More Weather Information:

Grand Portage MN

[NOTICE]

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Last Update: 9:36 am CDT Sep 10, 2026
Forecast Valid: 11am CDT Sep 10, 2026-6pm CDT Sep 16, 2026

Today

SSW wind 5 to 10 kt. Mostly sunny. Waves 1 ft or less.

Tonight

SW wind 5 to 10 kt, with gusts as high as 20 kt. Partly cloudy. Waves 1 ft or less.

Friday

SW wind 10 to 15 kt, with gusts as high as 30 kt. Increasing clouds. Waves 1 ft or less.

Friday Night

SSW wind around 10 kt, with gusts as high as 25 kt. Showers and possibly a thunderstorm. Waves 1 ft or less.

Saturday

W wind around 10 kt, with gusts as high as 20 kt. Mostly sunny. Waves 1 ft or less.

Saturday Night

WNW wind 5 to 10 kt, with gusts as high as 20 kt. Partly cloudy. Waves 1 ft or less.

Sunday

Variable winds 5 kt or less. Partly sunny. Waves 1 ft or less.

Sunday Night

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

Monday

ESE wind 10 to 15 kt, with gusts as high as 25 kt. Showers likely. 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.