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Detroit/Pontiac, MI Local Forecast Office

18NM ENE Port Sanilac MI

Marine Point Forecast

[NOTICE]

Friday
High: 48 °F
SSW 23kt
5ft
Friday Night
Low: 37 °F
N 14kt
2ft
Saturday
High: 48 °F
SE 19kt
2-4ft
Saturday Night
Low: 36 °F
W 19kt
3-4ft
Sunday
High: 38 °F
W 20kt
4ft
Sunday Night
Low: 33 °F
WNW 17kt
3-4ft
Monday
High: 37 °F
W 12kt
1-3ft
Monday Night
Low: 27 °F
⇑NNW 26kt
5ft
Tuesday
High: 33 °F
N 28kt⇓
9ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 2:24 am EDT Apr 3, 2026
Forecast Valid: 3am EDT Apr 3, 2026-6pm EDT Apr 9, 2026

View Nearby Observations

Detailed Forecast

Friday

SSW wind 13 to 23 kt becoming W in the afternoon. Partly sunny. Waves 5 ft subsiding to 2 ft.

Friday Night

N wind 11 to 14 kt becoming ENE after midnight. A chance of rain, mainly after 5am. Waves around 2 ft.

Saturday

ESE wind 15 to 19 kt becoming SSE in the afternoon. Rain, with thunderstorms also possible after 2pm. Waves 2 to 4 ft.

Saturday Night

W wind around 19 kt. Rain and possibly a thunderstorm before 8pm, then a chance of rain between 8pm and 2am. Waves 3 to 4 ft.

Sunday

W wind around 20 kt. Partly sunny. Waves around 4 ft.

Sunday Night

WNW wind 14 to 17 kt. Mostly cloudy. Waves 3 to 4 ft.

Monday

W wind 9 to 12 kt. A chance of rain and snow after 2pm. Waves 1 to 3 ft.

Monday Night

NNW wind 12 to 17 kt increasing to 21 to 26 kt after midnight. A chance of rain and snow before 8pm, then a chance of snow. Waves 1 ft building to 5 ft.

Tuesday

N wind 23 to 28 kt decreasing to 16 to 21 kt in the afternoon. Partly sunny. Waves 9 ft subsiding to 6 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.