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Detroit/Pontiac, MI Local Forecast Office

4NM S Monroe MI

Marine Point Forecast

[NOTICE]

Today
High: 70 °F
ESE 9kt
< 1ft
Tonight
Low: 68 °F
ESE 7kt
< 1ft
Sunday
High: 69 °F
NNE 12kt
< 1ft
Sunday Night
Low: 56 °F
NE 15kt
< 1ft
Monday
High: 62 °F
NE 18kt
< 1ft
Monday Night
Low: 54 °F
NE 17kt
< 1ft
Tuesday
High: 61 °F
ENE 20kt
< 1ft
Tuesday Night
Low: 55 °F
ENE 20kt
< 1ft
Wednesday
High: 61 °F
E 20kt
< 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 Sep 19, 2026
Forecast Valid: 5am EDT Sep 19, 2026-6pm EDT Sep 25, 2026

View Nearby Observations

Detailed Forecast

Today

ENE wind 6 to 9 kt becoming ESE in the afternoon. Showers before 2pm, then showers likely and possibly a thunderstorm between 2pm and 3pm, then a chance of showers and thunderstorms after 3pm. Waves 1 ft or less.

Tonight

ESE wind 5 to 7 kt becoming S after midnight. A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 11pm. Patchy fog after 5am. Waves 1 ft or less.

Sunday

W wind 8 to 12 kt becoming NE in the afternoon. Showers before 2pm. Patchy fog before 11am. Waves 1 ft or less.

Sunday Night

NE wind around 15 kt, with gusts as high as 25 kt. Mostly cloudy. Waves 1 ft or less.

Monday

NE wind 15 to 18 kt, with gusts as high as 24 kt. Mostly cloudy. Waves 1 ft or less.

Monday Night

NE wind 15 to 17 kt, with gusts as high as 29 kt. Mostly cloudy. Waves 1 ft or less.

Tuesday

ENE wind 18 to 20 kt, with gusts as high as 29 kt. Mostly cloudy. Waves 1 ft or less.

Tuesday Night

ENE wind around 20 kt, with gusts as high as 33 kt. A chance of showers. Waves 1 ft or less.

Wednesday

E wind 18 to 20 kt, with gusts as high as 32 kt. Showers likely. Waves 1 ft or less.

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

The water temperature at Belle Isle is 68 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.