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Detroit/Pontiac, MI Local Forecast Office

18NM ENE Port Sanilac MI

Marine Point Forecast

[NOTICE]

Today
High: 46 °F
S 30kt
8-9ft
Tonight
Low: 17 °F
WNW 34kt
9-11ft
Tuesday
High: 25 °F
WNW 28kt
10ft
Tuesday Night
Low: 22 °F
WNW 15kt
2-4ft
Wednesday
High: 36 °F
S 22kt
5ft
Wednesday Night
Low: 33 °F
S 19kt
3-4ft
Thursday
High: 39 °F
SSW 13kt
1-2ft
Thursday Night
Low: 33 °F
WNW 14kt
1-2ft
Friday
High: 38 °F
NW 17kt
2-3ft

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 am EDT Mar 16, 2026
Forecast Valid: 6am EDT Mar 16, 2026-6pm EDT Mar 22, 2026

View Nearby Observations

Detailed Forecast

Today

S wind 28 to 30 kt becoming SW in the afternoon. Winds could gust as high as 36 kt. A chance of rain showers before 3pm, then a chance of snow showers. Waves 8 to 9 ft. occasionally to 12ft.

Tonight

WNW wind 32 to 34 kt. A chance of snow showers, mainly before 3am. Widespread freezing spray. Waves 9 to 11 ft. occasionally to 14ft.

Tuesday

WNW wind 18 to 28 kt. Widespread freezing spray. Mostly cloudy. Waves 10 ft subsiding to 7 ft.

Tuesday Night

WNW wind 13 to 15 kt. Widespread freezing spray before 7pm. Mostly cloudy. Waves 2 to 4 ft.

Wednesday

S wind 16 to 22 kt. Mostly cloudy. Waves 2 ft building to 5 ft.

Wednesday Night

S wind 16 to 19 kt. Mostly cloudy. Waves 3 to 4 ft.

Thursday

SSW wind 10 to 13 kt. A chance of rain before 2pm. Waves 1 to 2 ft.

Thursday Night

WNW wind 10 to 14 kt. Mostly cloudy. Waves 1 to 2 ft.

Friday

NW wind around 17 kt. Mostly cloudy. Waves 2 to 3 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.