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Brownsville, TX Local Forecast Office

4NM ENE Port Isabel TX

Marine Point Forecast

[NOTICE]

Tonight
Low: 21 °C
SE 16km/h
< 1m
Saturday
High: 23 °C
E 16km/h
< 1m
Saturday Night
Low: 21 °C
ESE 16km/h
< 1m
Sunday
High: 22 °C
⇑NNE 37km/h
< 1m
Sunday Night
Low: 17 °C
NNE 42km/h
1-2m
Monday
High: 19 °C
NNE 35km/h⇓
1-2m
Monday Night
Low: 18 °C
NE 23km/h
1m
Tuesday
High: 22 °C
SE 23km/h
1m
Tuesday Night
Low: 21 °C
SE 23km/h
1m

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 7:30 pm CST Dec 12, 2025
Forecast Valid: 7pm CST Dec 12, 2025-6pm CST Dec 19, 2025

View Nearby Observations

Detailed Forecast

Tonight

SE wind around 16 km/h. A chance of showers and thunderstorms, mainly after 3am. Seas 1 m or less.

Saturday

E wind 14 to 16 km/h. A chance of showers and thunderstorms, mainly before 8am. Seas 1 m or less.

Saturday Night

ESE wind 10 to 16 km/h becoming ENE after midnight. A slight chance of showers and thunderstorms after midnight. Seas 1 m or less.

Sunday

NNE wind 10 to 20 km/h increasing to 27 to 37 km/h. Winds could gust as high as 45 km/h. Showers likely and possibly a thunderstorm. Seas 1 m or less.

Sunday Night

NNE wind 37 to 42 km/h, with gusts as high as 48 km/h. A chance of showers, mainly before midnight. Seas 1 to 2 m.

Monday

NNE wind 30 to 35 km/h decreasing to 24 to 29 km/h in the afternoon. Mostly cloudy. Seas 1 to 2 m.

Monday Night

NE wind 16 to 23 km/h becoming ESE after midnight. Mostly cloudy. Seas around 1 m.

Tuesday

SE wind 18 to 23 km/h. Mostly cloudy. Seas around 1 m.

Tuesday Night

SE wind 21 to 23 km/h. A chance of showers. Seas around 1 m.

Winds and seas higher in and near thunderstorms.

*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.