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Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 55 °F
Light Wind
< 1ft
Tonight
Low: 44 °F
Light Wind
< 1ft
Tuesday
High: 58 °F
Light Wind
< 1ft
Tuesday Night
Low: 43 °F
Light Wind
< 1ft
Wednesday
High: 54 °F
NE 10kt
< 1ft
Wednesday Night
Low: 44 °F
N 10kt
< 1ft
Thursday
High: 59 °F
Light Wind
< 1ft
Thursday Night
Low: 44 °F
Light Wind
< 1ft
Friday
High: 58 °F
Light Wind
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 1:21 pm CDT Jun 22, 2026
Forecast Valid: 3pm CDT Jun 22, 2026-6pm CDT Jun 29, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

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

Tonight

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

Tuesday

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

Tuesday Night

Variable winds 5 kt or less. Showers likely, with thunderstorms also possible after 4am. Waves 1 ft or less.

Wednesday

NE wind around 10 kt, with gusts as high as 20 kt. Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Waves 1 ft or less.

Wednesday Night

N wind 5 to 10 kt, with gusts as high as 15 kt. A slight chance of showers before 1am. Waves 1 ft or less.

Thursday

Variable winds 5 kt or less. A slight chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Waves 1 ft or less.

Thursday Night

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

Friday

Variable winds 5 kt or less. 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.