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Detroit/Pontiac, MI Local Forecast Office

18NM ENE Port Sanilac MI

Marine Point Forecast

[NOTICE]

Sunday
High: 50 °F
SE 29kt
8ft
Sunday Night
Low: 48 °F
SSE 31kt
7-9ft
Monday
High: 42 °F
SW 29kt
7-8ft
Monday Night
Low: 34 °F
WSW 34kt
9-10ft
Tuesday
High: 24 °F
WNW 31kt
10ft
Tuesday Night
Low: 17 °F
WNW 17kt
3-5ft
Wednesday
High: 34 °F
S 25kt
4-6ft
Wednesday Night
Low: 22 °F
S 19kt
3-4ft
Thursday
High: 40 °F
SSW 15kt
1-3ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 9:13 pm EDT Mar 14, 2026
Forecast Valid: 1am EDT Mar 15, 2026-6pm EDT Mar 21, 2026

View Nearby Observations

Detailed Forecast

Sunday

SE wind 23 to 29 kt, with gusts as high as 37 kt. Snow likely before 10am, then a slight chance of rain between 10am and 11am. Waves 4 ft building to 8 ft.

Sunday Night

SSE wind 28 to 31 kt, with gusts as high as 41 kt. A chance of showers before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then showers and possibly a thunderstorm after 2am. Waves 7 to 9 ft. occasionally to 12ft.

Monday

SW wind 25 to 29 kt. Rain before 11am, then a chance of snow between 11am and 2pm. Waves 7 to 8 ft. occasionally to 10ft.

Monday Night

WSW wind 32 to 34 kt, with gusts as high as 40 kt. A chance of snow after 8pm. Widespread freezing spray. Waves 9 to 10 ft. occasionally to 13ft.

Tuesday

WNW wind 21 to 31 kt. Widespread freezing spray. Mostly cloudy. Waves 10 ft subsiding to 7 ft.

Tuesday Night

WNW wind around 17 kt. Widespread freezing spray before 8pm. Mostly cloudy. Waves 3 to 5 ft.

Wednesday

S wind 19 to 25 kt. A chance of snow. Waves 4 to 6 ft. occasionally to 8ft.

Wednesday Night

S wind 15 to 19 kt. Mostly cloudy. Waves 3 to 4 ft.

Thursday

SSW wind 11 to 15 kt. Partly sunny. Waves 1 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.