Extreme Heat and Excessive Rainfall Today

Dangerous and extreme heat will remain across portions of the southern U.S. this week. A heat wave over the Southwest U.S. will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Multiple rounds of thunderstorms will produce heavy to excessive rainfall with significant flash flooding across portions of southern New England today. Read More >

For More Weather Information:

Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

This Afternoon
High: 64 °F
SSW 10kt
< 1ft
Tonight
Low: 53 °F
Light Wind
< 1ft
Thursday
High: 69 °F
SW 10kt
< 1ft
Thursday Night
Low: 56 °F
Light Wind
< 1ft
Friday
High: 69 °F
Light Wind
< 1ft
Friday Night
Low: 52 °F
Light Wind
< 1ft
Saturday
High: 67 °F
Light Wind
< 1ft
Saturday Night
Low: 50 °F
Light Wind
< 1ft
Sunday
High: 62 °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: 11:02 am CDT Jul 29, 2026
Forecast Valid: 2pm CDT Jul 29, 2026-6pm CDT Aug 4, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

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

Tonight

Variable winds 5 kt or less. A chance of showers and thunderstorms, mainly between 1am and 4am. Waves 1 ft or less.

Thursday

S wind 5 to 10 kt becoming SW in the afternoon. A slight chance of showers, with thunderstorms also possible after 1pm. Waves 1 ft or less.

Thursday Night

Variable winds 5 kt or less. A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Waves 1 ft or less.

Friday

Variable winds 5 kt or less. A chance of showers, with thunderstorms also possible after 1pm. Waves 1 ft or less.

Friday Night

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

Saturday

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

Saturday Night

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

Sunday

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.