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Detroit/Pontiac, MI Local Forecast Office

18NM ENE Port Sanilac MI

Marine Point Forecast

[NOTICE]

Today
High: 25 °F
NNW 28kt⇓
12ft
Tonight
Low: 27 °F
S 13kt
1-2ft
Wednesday
High: 43 °F
SSE 18kt
2-3ft
Wednesday Night
Low: 40 °F
S 24kt
4-6ft
Thursday
High: 48 °F
SSW 23kt
5-6ft
Thursday Night
Low: 38 °F
WSW 13kt
1-3ft
Friday
High: 40 °F
N 9kt
1ft
Friday Night
Low: 35 °F
N 10kt
1ft
Saturday
High: 40 °F
N 9kt
1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 4:24 am EDT Apr 7, 2026
Forecast Valid: 5am EDT Apr 7, 2026-6pm EDT Apr 13, 2026

View Nearby Observations

Detailed Forecast

Today

NNW wind 23 to 28 kt decreasing to 12 to 17 kt in the afternoon. Mostly cloudy through mid morning, then gradual clearing. Waves 12 ft subsiding to 4 ft.

Tonight

E wind 6 to 13 kt becoming S after midnight. Mostly clear. Waves 1 to 2 ft.

Wednesday

SSE wind 15 to 18 kt. Sunny. Waves 2 to 3 ft.

Wednesday Night

S wind 20 to 24 kt, with gusts as high as 30 kt. Partly cloudy. Waves 4 to 6 ft. occasionally to 8ft.

Thursday

SSW wind 16 to 23 kt. A chance of rain between 8am and 2pm. Waves 5 to 6 ft. occasionally to 8ft.

Thursday Night

WSW wind 9 to 13 kt becoming NE after midnight. A chance of rain after 2am. Waves 1 to 3 ft.

Friday

NE wind around 9 kt becoming N in the afternoon. Rain likely, mainly between 8am and 2pm. Waves around 1 ft.

Friday Night

N wind around 10 kt. Partly cloudy. Waves around 1 ft.

Saturday

N wind 6 to 9 kt. 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.