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Detroit/Pontiac, MI Local Forecast Office

18NM ENE Port Sanilac MI

Marine Point Forecast

[NOTICE]

Tonight
Low: 36 °F
WSW 18kt
2-3ft
Sunday
High: 38 °F
W 19kt
3-4ft
Sunday Night
Low: 33 °F
WNW 17kt
2-3ft
Monday
High: 36 °F
W 10kt
1-2ft
Monday Night
Low: 24 °F
⇑NNW 30kt
8ft
Tuesday
High: 31 °F
NNW 24kt⇓
9ft
Tuesday Night
Low: 28 °F
S 14kt
1-2ft
Wednesday
High: 43 °F
S 21kt
3-4ft
Wednesday Night
Low: 41 °F
S 27kt
5-7ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 4:24 pm EDT Apr 4, 2026
Forecast Valid: 6pm EDT Apr 4, 2026-6pm EDT Apr 11, 2026

View Nearby Observations

Detailed Forecast

Tonight

S wind 13 to 18 kt becoming WSW in the evening. Rain and possibly a thunderstorm before 9pm, then a chance of rain between 9pm and 11pm. Waves 2 to 3 ft.

Sunday

W wind around 19 kt, with gusts as high as 26 kt. Partly sunny. Waves 3 to 4 ft.

Sunday Night

WNW wind 10 to 17 kt. Mostly cloudy. Waves 2 to 3 ft.

Monday

W wind around 10 kt becoming NNW in the afternoon. Rain and snow likely after 2pm. Waves 1 to 2 ft.

Monday Night

NNW wind 19 to 24 kt increasing to 25 to 30 kt after midnight. Rain and snow likely before 8pm, then a chance of snow between 8pm and 2am. Waves 2 ft building to 8 ft.

Tuesday

NNW wind 19 to 24 kt decreasing to 11 to 16 kt in the afternoon. Mostly cloudy, then gradually becoming sunny. Waves 9 ft subsiding to 4 ft.

Tuesday Night

S wind 7 to 14 kt. Mostly clear. Waves 1 to 2 ft.

Wednesday

S wind 18 to 21 kt. Mostly sunny. Waves 3 to 4 ft.

Wednesday Night

S wind 22 to 27 kt. A chance of rain. Waves 5 to 7 ft. occasionally to 9ft.

*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.