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Detroit/Pontiac, MI Local Forecast Office

3NM N Grosse Ile MI

Marine Point Forecast

[NOTICE]

Tonight
Low: 70 °F
W 8kt⇓
< 1ft
Friday
High: 83 °F
Light Wind
< 1ft
Friday Night
Low: 67 °F
E 7kt
< 1ft
Saturday
High: 84 °F
ENE 9kt
< 1ft
Saturday Night
Low: 66 °F
ENE 8kt⇓
< 1ft
Sunday
High: 83 °F
⇑E 8kt
< 1ft
Sunday Night
Low: 67 °F
ESE 7kt⇓
< 1ft
Monday
High: 86 °F
⇑SSE 6kt
< 1ft
Monday Night
Low: 71 °F
S 7kt⇓
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 4:25 pm EDT Jul 9, 2026
Forecast Valid: 6pm EDT Jul 9, 2026-6pm EDT Jul 16, 2026

View Nearby Observations

Detailed Forecast

Tonight

W wind 5 to 8 kt becoming variable and less than 5 kt after midnight. Showers and thunderstorms likely before 10pm, then a slight chance of showers and thunderstorms after 2am. Waves 1 ft or less.

Friday

Variable winds 5 kt or less. A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Waves 1 ft or less.

Friday Night

E wind 5 to 7 kt becoming NNE after midnight. A chance of showers between 7pm and 8pm. Waves 1 ft or less.

Saturday

ENE wind 7 to 9 kt. Mostly sunny. Waves 1 ft or less.

Saturday Night

ENE wind 5 to 8 kt becoming variable and less than 5 kt after midnight. Partly cloudy. Waves 1 ft or less.

Sunday

Variable winds less than 5 kt becoming E 5 to 8 kt in the morning. Sunny. Waves 1 ft or less.

Sunday Night

ESE wind 5 to 7 kt becoming variable and less than 5 kt in the evening. Mostly clear. Waves 1 ft or less.

Monday

Variable winds less than 5 kt becoming SSE around 6 kt in the afternoon. Sunny. Waves 1 ft or less.

Monday Night

S wind 5 to 7 kt becoming variable and less than 5 kt in the evening. Mostly clear. 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.