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Detroit/Pontiac, MI Local Forecast Office

18NM ENE Port Sanilac MI

Marine Point Forecast

[NOTICE]

Thursday
High: 49 °F
S 13kt
1ft
Thursday Night
Low: 41 °F
N 10kt
1ft
Friday
High: 48 °F
N 6kt⇓
< 1ft
Friday Night
Low: 43 °F
SSE 19kt
3ft
Saturday
High: 50 °F
S 22kt
4-5ft
Saturday Night
Low: 34 °F
WNW 19kt
3-4ft
Sunday
High: 38 °F
WNW 20kt
5ft
Sunday Night
Low: 31 °F
NW 23kt
8ft
Monday
High: 39 °F
NW 22kt
7ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 2:49 am EDT Apr 16, 2026
Forecast Valid: 3am EDT Apr 16, 2026-6pm EDT Apr 22, 2026

View Nearby Observations

Detailed Forecast

Thursday

S wind 11 to 13 kt becoming NW in the afternoon. Showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Waves around 1 ft.

Thursday Night

N wind 8 to 10 kt. Showers likely, mainly before 8pm. Waves around 1 ft.

Friday

N wind around 6 kt becoming variable and less than 5 kt. Partly sunny. Waves 1 ft or less.

Friday Night

SSE wind 9 to 19 kt. A chance of showers after 2am. Waves 1 ft or less building to 3 ft.

Saturday

S wind 19 to 22 kt becoming SW in the afternoon. Showers, mainly between 8am and 2pm. Waves 4 to 5 ft.

Saturday Night

WNW wind 16 to 19 kt. A chance of showers before 2am. Waves 3 to 4 ft.

Sunday

WNW wind around 20 kt. Partly sunny. Waves around 5 ft.

Sunday Night

NW wind 20 to 23 kt. Mostly cloudy. Waves 5 ft building to 8 ft.

Monday

NW wind 13 to 22 kt. Mostly sunny. Waves 7 ft subsiding to 4 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.