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Detroit/Pontiac, MI Local Forecast Office

18NM ENE Port Sanilac MI

Marine Point Forecast

[NOTICE]

Wednesday
High: 44 °F
SE 17kt
2ft
Wednesday Night
Low: 29 °F
NW 29kt
6-8ft
Thursday
High: 34 °F
WNW 24kt
7ft
Thursday Night
Low: 29 °F
SSE 18kt
1-2ft
Friday
High: 39 °F
S 34kt
8ft
Friday Night
Low: 25 °F
WNW 37kt
10-12ft
Saturday
High: 31 °F
NW 21kt⇓
8ft
Saturday Night
Low: 28 °F
ESE 18kt
2-4ft
Sunday
High: 39 °F
E 30kt
6-7ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 3:35 am EDT Mar 11, 2026
Forecast Valid: 4am EDT Mar 11, 2026-6pm EDT Mar 17, 2026

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Detailed Forecast

Wednesday

SE wind 12 to 17 kt becoming WNW in the afternoon. Rain and thunderstorms before 3pm, then rain likely. Waves around 2 ft.

Wednesday Night

NW wind 25 to 29 kt. A chance of rain, snow, and sleet before 8pm, then a slight chance of snow between 8pm and 2am. Waves 6 to 8 ft. occasionally to 10ft.

Thursday

WNW wind 16 to 24 kt. Mostly sunny. Waves 7 ft subsiding to 4 ft.

Thursday Night

NNW wind 8 to 18 kt becoming SSE after midnight. Snow likely after 2am. Waves 1 to 2 ft.

Friday

S wind around 34 kt becoming WSW in the afternoon. Winds could gust as high as 42 kt. Rain and snow likely before 8am, then rain likely between 8am and 5pm, then a chance of rain and snow after 5pm. Waves 5 ft building to 8 ft.

Friday Night

WNW wind 28 to 37 kt, with gusts as high as 45 kt. A chance of snow before 8pm. Waves 10 to 12 ft. occasionally to 16ft.

Saturday

NW wind 16 to 21 kt decreasing to 9 to 14 kt in the afternoon. Partly sunny. Waves 8 ft subsiding to 4 ft.

Saturday Night

ESE wind 8 to 18 kt. A chance of snow. Waves 2 to 4 ft.

Sunday

E wind 26 to 30 kt. Rain and snow. Waves 6 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.