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Detroit/Pontiac, MI Local Forecast Office

18NM ENE Port Sanilac MI

Marine Point Forecast

[NOTICE]

This Afternoon
High: 49 °F
SSE 18kt
3ft
Tonight
Low: 46 °F
SSW 23kt
4-5ft
Monday
High: 51 °F
WSW 20kt
3-5ft
Monday Night
Low: 45 °F
S 14kt
1-2ft
Tuesday
High: 52 °F
SW 18kt
3-4ft
Tuesday Night
Low: 41 °F
SW 12kt
1-2ft
Wednesday
High: 49 °F
N 12kt
2ft
Wednesday Night
Low: 44 °F
SSW 16kt
2-3ft
Thursday
High: 51 °F
S 20kt
3-4ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 10:14 am EDT Apr 12, 2026
Forecast Valid: 1pm EDT Apr 12, 2026-6pm EDT Apr 18, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

SSE wind around 18 kt. Showers and thunderstorms likely before 3pm, then a chance of showers between 3pm and 5pm, then a chance of showers and thunderstorms after 5pm. Waves around 3 ft.

Tonight

SSW wind 19 to 23 kt. Showers and thunderstorms likely, then showers after 3am. Waves 4 to 5 ft.

Monday

WSW wind 14 to 20 kt. A chance of showers before 2pm. Waves 3 to 5 ft.

Monday Night

S wind 8 to 14 kt. Showers and possibly a thunderstorm, mainly after 2am. Waves 1 to 2 ft.

Tuesday

SW wind 15 to 18 kt. Showers and possibly a thunderstorm before 2pm, then showers likely between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Waves 3 to 4 ft.

Tuesday Night

SW wind 10 to 12 kt. Showers likely and possibly a thunderstorm before 11pm, then showers likely between 11pm and 2am, then showers likely and possibly a thunderstorm after 2am. Waves 1 to 2 ft.

Wednesday

N wind around 12 kt becoming WSW in the afternoon. A chance of showers and thunderstorms, then showers likely after 8am. Waves around 2 ft.

Wednesday Night

SSW wind 12 to 16 kt. Showers. Waves 2 to 3 ft.

Thursday

S wind 16 to 20 kt. Showers, with thunderstorms also possible after 2pm. Waves 3 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.