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Detroit/Pontiac, MI Local Forecast Office

4NM S Monroe MI

Marine Point Forecast

[NOTICE]

This Afternoon
High: 78 °F
SSW 9kt
< 1ft
Tonight
Low: 67 °F
SSW 7kt
< 1ft
Sunday
High: 79 °F
WNW 11kt
< 1ft
Sunday Night
Low: 55 °F
NW 12kt
< 1ft
Monday
High: 67 °F
N 7kt
< 1ft
Monday Night
Low: 59 °F
SSE 11kt
< 1ft
Tuesday
High: 80 °F
SSW 13kt
< 1ft
Tuesday Night
Low: 68 °F
SSW 9kt
< 1ft
Wednesday
High: 77 °F
ENE 6kt
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 12:49 pm EDT Sep 12, 2026
Forecast Valid: 1pm EDT Sep 12, 2026-6pm EDT Sep 18, 2026

View Nearby Observations

Detailed Forecast

This Afternoon

SSW wind around 9 kt. A slight chance of showers before 2pm, then a slight chance of showers and thunderstorms between 2pm and 3pm. Waves 1 ft or less.

Tonight

SSW wind 5 to 7 kt becoming W after midnight. Partly cloudy. Waves 1 ft or less.

Sunday

WNW wind 5 to 11 kt. Mostly sunny. Waves 1 ft or less.

Sunday Night

NW wind 8 to 12 kt, with gusts as high as 19 kt. Cloudy during the early evening, then gradual clearing. Waves 1 ft or less.

Monday

N wind 5 to 7 kt becoming E in the afternoon. Sunny. Waves 1 ft or less.

Monday Night

SSE wind 7 to 11 kt, with gusts as high as 20 kt. Partly cloudy. Waves 1 ft or less.

Tuesday

SSW wind around 13 kt, with gusts as high as 19 kt. Partly sunny. Waves 1 ft or less.

Tuesday Night

SSW wind 6 to 9 kt becoming W after midnight. Showers likely and possibly a thunderstorm between 8pm and 2am, then showers likely after 2am. Waves 1 ft or less.

Wednesday

ENE wind around 6 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 70 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.