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Detroit/Pontiac, MI Local Forecast Office

7NM S Grosse Ile MI

Marine Point Forecast

[NOTICE]

Today
High: 35 °F
SSW 20kt
2-3ft

Small Craft Advisory
Tonight
Low: 31 °F
SSW 25kt
2-4ft

Small Craft Advisory
Wednesday
High: 38 °F
SW 22kt
1-3ft

Small Craft Advisory
Wednesday Night
Low: 21 °F
WNW 17kt
< 1ft

Small Craft Advisory
Thursday
High: 27 °F
W 13kt
< 1ft
Thursday Night
Low: 19 °F
W 11kt
< 1ft
Friday
High: 28 °F
SW 11kt
< 1ft
Friday Night
Low: 17 °F
W 18kt
1-2ft
Saturday
High: 22 °F
W 18kt
1-2ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 4:13 am EST Dec 9, 2025
Forecast Valid: 7am EST Dec 9, 2025-6pm EST Dec 15, 2025

View Nearby Observations

Detailed Forecast

Today

SSW wind 17 to 20 kt. Snow, mainly before 11am. Waves 2 to 3 ft.

Tonight

SSW wind 16 to 25 kt, with gusts as high as 31 kt. Rain and snow, mainly before 5am. Waves 2 to 4 ft.

Wednesday

SW wind 17 to 22 kt becoming WNW in the afternoon. Winds could gust as high as 30 kt. Rain before 11am, then rain and snow between 11am and 1pm, then a chance of snow after 1pm. Waves 1 to 3 ft.

Wednesday Night

WNW wind 13 to 17 kt, with gusts as high as 23 kt. Mostly cloudy. Waves 1 ft or less.

Thursday

W wind around 13 kt. Partly sunny. Waves 1 ft or less.

Thursday Night

W wind 8 to 11 kt. Mostly cloudy. Waves 1 ft or less.

Friday

SW wind 8 to 11 kt. A chance of snow. Waves 1 ft or less.

Friday Night

W wind 13 to 18 kt. A chance of snow. Waves 1 to 2 ft.

Saturday

W wind 14 to 18 kt, with gusts as high as 24 kt. A chance of snow. Waves 1 to 2 ft.

*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.