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Detroit/Pontiac, MI Local Forecast Office

18NM ENE Port Sanilac MI

Marine Point Forecast

[NOTICE]

Tonight
Low: 28 °F
NW 34kt
10ft
Saturday
High: 29 °F
NW 25kt⇓
9ft
Saturday Night
Low: 29 °F
ESE 15kt
2-3ft
Sunday
High: 48 °F
SE 28kt
5-7ft
Sunday Night
Low: 36 °F
S 34kt
11ft
Monday
High: 46 °F
SW 31kt
9-10ft
Monday Night
Low: 17 °F
W 37kt
11-12ft
Tuesday
High: 24 °F
WNW 32kt
12ft
Tuesday Night
Low: 21 °F
WNW 22kt
4-6ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 6:35 pm EDT Mar 13, 2026
Forecast Valid: 7pm EDT Mar 13, 2026-6pm EDT Mar 20, 2026

View Nearby Observations

Detailed Forecast

Tonight

WSW wind 26 to 34 kt becoming NW after midnight. Winds could gust as high as 43 kt. Rain and snow showers, becoming all snow after 10pm. Waves 6 ft building to 10 ft.

Saturday

NW wind 20 to 25 kt decreasing to 11 to 16 kt in the afternoon. A slight chance of snow showers before 7am. Waves 9 ft subsiding to 4 ft.

Saturday Night

ESE wind 7 to 15 kt. Snow likely after 2am. Waves 2 to 3 ft.

Sunday

SE wind 26 to 28 kt. Snow likely before 11am, then rain likely. Waves 5 to 7 ft. occasionally to 9ft.

Sunday Night

S wind 28 to 34 kt, with gusts as high as 45 kt. Rain, mainly after 2am. Waves 8 ft building to 11 ft.

Monday

S wind around 31 kt becoming SW in the afternoon. Winds could gust as high as 37 kt. Rain before 2pm, then a chance of snow. Waves 9 to 10 ft. occasionally to 13ft.

Monday Night

W wind around 37 kt. A chance of snow. Waves 11 to 12 ft. occasionally to 16ft.

Tuesday

WNW wind 24 to 32 kt. Mostly cloudy. Waves 12 ft subsiding to 8 ft.

Tuesday Night

WNW wind 19 to 22 kt. Mostly cloudy. Waves 4 to 6 ft. occasionally to 8ft.

*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.