For More Weather Information:

Detroit/Pontiac, MI Local Forecast Office

18NM ENE Port Sanilac MI

Marine Point Forecast

[NOTICE]

Tuesday
High: 48 °F
S 18kt
2-4ft
Tuesday Night
Low: 45 °F
SE 12kt
1-2ft
Wednesday
High: 46 °F
SSW 12kt
1-2ft
Wednesday Night
Low: 45 °F
SSW 12kt
1-2ft
Thursday
High: 49 °F
WSW 14kt
3ft
Thursday Night
Low: 40 °F
NW 12kt
2-3ft
Friday
High: 47 °F
N 11kt
1-2ft
Friday Night
Low: 42 °F
SSE 16kt
1-3ft
Saturday
High: 53 °F
S 23kt
5ft

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 14, 2026
Forecast Valid: 3am EDT Apr 14, 2026-6pm EDT Apr 20, 2026

View Nearby Observations

Detailed Forecast

Tuesday

S wind 13 to 18 kt becoming NW in the afternoon. Showers and thunderstorms, mainly before 9am. Patchy dense fog before 1pm, then Patchy dense fog after 4pm. Waves 2 to 4 ft.

Tuesday Night

E wind 9 to 12 kt becoming S after midnight. Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Some of the storms could produce heavy rainfall. Patchy fog before 9pm. Waves 1 to 2 ft.

Wednesday

SSW wind 10 to 12 kt. Showers likely, mainly after 2pm. Waves 1 to 2 ft.

Wednesday Night

SSW wind 9 to 12 kt. Showers and possibly a thunderstorm. Waves 1 to 2 ft.

Thursday

WSW wind around 14 kt. Showers likely, mainly after 2pm. Waves around 3 ft.

Thursday Night

NW wind around 12 kt. Showers likely, mainly before 8pm. Waves 2 to 3 ft.

Friday

N wind 9 to 11 kt. Mostly cloudy. Waves 1 to 2 ft.

Friday Night

E wind 8 to 16 kt becoming SSE after midnight. Mostly cloudy. Waves 1 to 3 ft.

Saturday

S wind 21 to 23 kt. Showers. Waves around 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.