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Detroit/Pontiac, MI Local Forecast Office

18NM ENE Port Sanilac MI

Marine Point Forecast

[NOTICE]

Tonight
Low: 33 °F
N 18kt
4ft
Wednesday
High: 33 °F
N 17kt
3-4ft
Wednesday Night
Low: 33 °F
NNE 16kt
2-4ft
Thursday
High: 49 °F
ESE 17kt
2-3ft
Thursday Night
Low: 45 °F
S 25kt
5-7ft
Friday
High: 50 °F
SW 20kt
5ft
Friday Night
Low: 39 °F
N 15kt
2ft
Saturday
High: 50 °F
SSE 19kt
3-4ft
Saturday Night
Low: 36 °F
WSW 22kt
4-5ft

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 Mar 31, 2026
Forecast Valid: 9pm EDT Mar 31, 2026-6pm EDT Apr 7, 2026

View Nearby Observations

Detailed Forecast

Tonight

N wind 14 to 18 kt, with gusts as high as 26 kt. A chance of showers, mainly before 10pm. Waves 1 ft building to 4 ft.

Wednesday

N wind around 17 kt. Mostly cloudy. Waves 3 to 4 ft.

Wednesday Night

NNE wind 13 to 16 kt becoming E after midnight. A chance of showers after 2am. Waves 2 to 4 ft.

Thursday

ESE wind 14 to 17 kt. Showers likely, mainly between 8am and 2pm. Waves 2 to 3 ft.

Thursday Night

S wind 22 to 25 kt. Showers before 11pm, then showers and possibly a thunderstorm between 11pm and 2am, then showers likely after 2am. Waves 5 to 7 ft. occasionally to 9ft.

Friday

SW wind 14 to 20 kt becoming W in the afternoon. Showers likely before 8am. Waves 5 ft subsiding to 2 ft.

Friday Night

N wind around 15 kt. A chance of rain after 2am. Waves around 2 ft.

Saturday

SE wind 17 to 19 kt becoming S in the afternoon. A chance of rain before 8am, then rain likely and possibly a thunderstorm between 8am and 2pm, then rain after 2pm. Waves 3 to 4 ft.

Saturday Night

WSW wind 18 to 22 kt. Rain. Waves 4 to 5 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.