For More Weather Information:

21NM E Grand Portage MN

[NOTICE]

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Last Update: 12:25 pm CDT Aug 13, 2025
Forecast Valid: 12pm CDT Aug 13, 2025-6pm CDT Aug 19, 2025

This Afternoon

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

Tonight

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

Thursday

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

Thursday Night

ESE wind around 10 kt becoming S after midnight. Winds could gust as high as 20 kt. A chance of showers after 1am. Waves 1 ft or less.

Friday

SSW wind 10 to 15 kt, with gusts as high as 20 kt. A slight chance of showers, with thunderstorms also possible after 1pm. Waves 1 ft or less.

Friday Night

SW wind 5 to 10 kt becoming WNW after midnight. A chance of showers and thunderstorms. Waves 1 ft or less.

Saturday

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

Saturday Night

W wind 5 to 10 kt becoming NE after midnight. Winds could gust as high as 20 kt. Partly cloudy. Waves 1 ft or less.

Sunday

NE wind around 10 kt, with gusts as high as 20 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.