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Grand Portage MN

[NOTICE]

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Last Update: 11:40 am CDT Jul 17, 2025
Forecast Valid: 11am CDT Jul 17, 2025-6pm CDT Jul 23, 2025

Today

SW wind 5 to 15 km/h. Mostly sunny. Waves 1 m or less.

Tonight

SW wind 10 to 15 km/h becoming W after midnight. Winds could gust as high as 25 km/h. Partly cloudy. Waves 1 m or less.

Friday

W wind 5 to 10 km/h becoming SW 10 to 15 km/h in the afternoon. A chance of showers after 1pm. Waves 1 m or less.

Friday Night

SW wind 5 to 10 km/h becoming NW after midnight. A chance of showers, mainly before 1am. Waves 1 m or less.

Saturday

N wind 5 to 10 km/h becoming S in the afternoon. Mostly sunny. Waves 1 m or less.

Saturday Night

SW wind 5 to 10 km/h becoming NW after midnight. Partly cloudy. Waves 1 m or less.

Sunday

N wind 5 to 10 km/h becoming SSE in the afternoon. Mostly sunny. Waves 1 m or less.

Sunday Night

Variable winds 5 km/h or less. Mostly cloudy. Waves 1 m or less.

Monday

E wind 5 to 10 km/h. A chance of showers. 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.