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Detroit/Pontiac, MI Local Forecast Office

4NM S Monroe MI

Marine Point Forecast

[NOTICE]

This Afternoon
High: 76 °F
ESE 9kt
< 1ft
Tonight
Low: 65 °F
ESE 7kt
< 1ft
Saturday
High: 76 °F
WSW 9kt
< 1ft
Saturday Night
Low: 60 °F
NW 9kt
< 1ft
Sunday
High: 74 °F
WNW 13kt
< 1ft
Sunday Night
Low: 57 °F
NW 8kt
< 1ft
Monday
High: 73 °F
WNW 9kt
< 1ft
Monday Night
Low: 58 °F
Light Wind
< 1ft
Tuesday
High: 76 °F
Light Wind
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 10:13 am EDT Aug 21, 2026
Forecast Valid: 12pm EDT Aug 21, 2026-6pm EDT Aug 27, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

ESE wind around 9 kt. Mostly sunny. Waves 1 ft or less.

Tonight

ESE wind 5 to 7 kt becoming S after midnight. A slight chance of showers and thunderstorms between 9pm and 11pm. Waves 1 ft or less.

Saturday

WSW wind 6 to 9 kt. Showers and possibly a thunderstorm. Waves 1 ft or less.

Saturday Night

NW wind around 9 kt. Showers likely and possibly a thunderstorm before 7pm, then a chance of showers and thunderstorms between 7pm and 8pm. Waves 1 ft or less.

Sunday

WNW wind 11 to 13 kt. Sunny. Waves 1 ft or less.

Sunday Night

NW wind around 8 kt. Mostly clear. Waves 1 ft or less.

Monday

WNW wind around 9 kt. Sunny. Waves 1 ft or less.

Monday Night

Variable winds 5 kt or less. Mostly clear. Waves 1 ft or less.

Tuesday

Variable winds 5 kt or less. Mostly sunny. Waves 1 ft or less.

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

The water temperature at Belle Isle is 72 degrees.

*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.