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Detroit/Pontiac, MI Local Forecast Office

3NM N Grosse Ile MI

Marine Point Forecast

[NOTICE]

Overnight
Low: 70 °F
Light Wind
< 1ft
Thursday
High: 84 °F
⇑SSW 8kt
< 1ft
Thursday Night
Low: 70 °F
S 6kt⇓
< 1ft
Friday
High: 84 °F
⇑SSW 8kt
< 1ft
Friday Night
Low: 70 °F
SSW 8kt
< 1ft
Saturday
High: 86 °F
WSW 10kt
< 1ft
Saturday Night
Low: 67 °F
W 9kt
< 1ft
Sunday
High: 84 °F
⇑SSW 11kt
< 1ft
Sunday Night
Low: 70 °F
SW 10kt
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 9:50 pm EDT Aug 5, 2026
Forecast Valid: 11pm EDT Aug 5, 2026-6pm EDT Aug 12, 2026

View Nearby Observations

Detailed Forecast

Overnight

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

Thursday

Variable winds less than 5 kt becoming SSW 5 to 8 kt in the afternoon. A chance of showers, with thunderstorms also possible after 2pm. Waves 1 ft or less.

Thursday Night

S wind around 6 kt becoming variable and less than 5 kt in the evening. A chance of showers and thunderstorms before 3am, then a chance of showers between 3am and 5am. Waves 1 ft or less.

Friday

Variable winds less than 5 kt becoming SSW 5 to 8 kt in the morning. A chance of showers between 7am and 5pm, then a chance of showers and thunderstorms after 5pm. Waves 1 ft or less.

Friday Night

SSW wind 6 to 8 kt. A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Waves 1 ft or less.

Saturday

WSW wind 8 to 10 kt. A chance of showers between 8am and 2pm. Waves 1 ft or less.

Saturday Night

W wind 5 to 9 kt. Mostly clear. Waves 1 ft or less.

Sunday

Variable winds less than 5 kt becoming SSW 6 to 11 kt in the morning. Winds could gust as high as 18 kt. Mostly sunny. Waves 1 ft or less.

Sunday Night

SW wind 6 to 10 kt. A chance of showers and thunderstorms. 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.