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Detroit/Pontiac, MI Local Forecast Office

5NM S Port Sanilac MI

Marine Point Forecast

[NOTICE]

Tonight
Low: 66 °F
SSW 12kt
< 1ft
Tuesday
High: 76 °F
W 19kt
1ft
Tuesday Night
Low: 58 °F
NW 15kt
< 1ft
Wednesday
High: 61 °F
N 12kt
< 1ft
Wednesday Night
Low: 53 °F
N 15kt
2ft
Thursday
High: 59 °F
ENE 13kt
1-2ft
Thursday Night
Low: 50 °F
ESE 10kt
1ft
Friday
High: 60 °F
WNW 25kt
1-3ft
Friday Night
Low: 40 °F
NW 27kt
5-6ft

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 pm EDT Oct 12, 2026
Forecast Valid: 7pm EDT Oct 12, 2026-6pm EDT Oct 19, 2026

View Nearby Observations

Detailed Forecast

Tonight

SSW wind 9 to 12 kt. Rain and thunderstorms likely, mainly before 3am. Waves 1 ft or less.

Tuesday

SSW wind 12 to 19 kt becoming W in the afternoon. Winds could gust as high as 25 kt. A chance of rain and thunderstorms, mainly before 7am. Waves around 1 ft.

Tuesday Night

NW wind 6 to 15 kt. Increasing clouds. Waves 1 ft or less.

Wednesday

N wind 6 to 12 kt. Partly sunny. Waves 1 ft or less.

Wednesday Night

N wind 12 to 15 kt. Mostly cloudy. Waves around 2 ft.

Thursday

ENE wind 8 to 13 kt becoming ESE in the afternoon. Mostly cloudy. Waves 1 to 2 ft.

Thursday Night

ESE wind 7 to 10 kt becoming S after midnight. Rain. Waves around 1 ft.

Friday

WNW wind 16 to 25 kt, with gusts as high as 37 kt. Rain likely. Waves 1 to 3 ft.

Friday Night

NW wind 22 to 27 kt, with gusts as high as 37 kt. Mostly cloudy. Waves 5 to 6 ft. occasionally to 8ft.

See Lake Huron Open Lake Forecast for days 3 through 5.

*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.