For More Weather Information:

Detroit/Pontiac, MI Local Forecast Office

18NM ENE Port Sanilac MI

Marine Point Forecast

[NOTICE]

Monday
High: 51 °F
SSW 22kt
3-5ft
Monday Night
Low: 42 °F
S 12kt
< 1ft
Tuesday
High: 53 °F
SW 18kt
3-4ft
Tuesday Night
Low: 42 °F
SSW 13kt
2ft
Wednesday
High: 48 °F
WSW 12kt
1-2ft
Wednesday Night
Low: 43 °F
S 13kt
1-3ft
Thursday
High: 51 °F
SSW 17kt
3-4ft
Thursday Night
Low: 40 °F
SW 15kt
1-2ft
Friday
High: 49 °F
NNW 12kt
1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 3:13 am EDT Apr 13, 2026
Forecast Valid: 3am EDT Apr 13, 2026-6pm EDT Apr 19, 2026

View Nearby Observations

Detailed Forecast

Monday

SSW wind 14 to 22 kt becoming W in the afternoon. Showers likely, mainly before 7am. Waves 3 to 5 ft.

Monday Night

NNE wind 7 to 12 kt becoming S after midnight. A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Waves 1 ft or less.

Tuesday

SW wind 16 to 18 kt. Showers and possibly a thunderstorm, mainly before 2pm, then a chance of showers and thunderstorms after 2pm. Waves 3 to 4 ft.

Tuesday Night

SSW wind around 13 kt. Showers and thunderstorms likely before 2am, then showers between 2am and 5am, then showers and possibly a thunderstorm after 5am. Waves around 2 ft.

Wednesday

WSW wind 10 to 12 kt. Showers and possibly a thunderstorm before 8am, then a chance of showers between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Waves 1 to 2 ft.

Wednesday Night

S wind 10 to 13 kt. Showers likely and possibly a thunderstorm, then showers after 8pm. Waves 1 to 3 ft.

Thursday

SSW wind around 17 kt. Showers, with thunderstorms also possible after 2pm. Waves 3 to 4 ft.

Thursday Night

SW wind 13 to 15 kt becoming WNW after midnight. A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Waves 1 to 2 ft.

Friday

NNW wind 8 to 12 kt. Partly sunny. Waves around 1 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.