Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

For More Weather Information:

Duluth, MN Local Forecast Office

10NM SW Grand Portage MN

Marine Point Forecast

[NOTICE]

Tonight
Low: 54 °F
Light Wind
< 1ft
Thursday
High: 63 °F
Light Wind
< 1ft
Thursday Night
Low: 52 °F
Light Wind
< 1ft
Friday
High: 66 °F
Light Wind
< 1ft
Friday Night
Low: 54 °F
Light Wind
< 1ft
Saturday
High: 69 °F
NW 10kt
< 1ft
Saturday Night
Low: 51 °F
NNW 10kt
< 1ft
Sunday
High: 64 °F
N 10kt
< 1ft
Sunday Night
Low: 50 °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: 5:26 pm CDT Aug 19, 2026
Forecast Valid: 6pm CDT Aug 19, 2026-6pm CDT Aug 26, 2026

View Nearby Observations

Detailed Forecast

Tonight

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

Thursday

Variable winds 5 kt or less. A chance of showers, with thunderstorms also possible after 4pm. Waves 1 ft or less.

Thursday Night

Variable winds 5 kt or less. A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 11pm. Waves 1 ft or less.

Friday

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

Friday Night

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

Saturday

NW wind around 10 kt. Mostly sunny. Waves 1 ft or less.

Saturday Night

NNW wind 5 to 10 kt. Partly cloudy. Waves 1 ft or less.

Sunday

N wind 5 to 10 kt becoming S in the afternoon. Mostly sunny. Waves 1 ft or less.

Sunday Night

Variable winds 5 kt or less. Partly cloudy. 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.