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Brownsville, TX Local Forecast Office

4NM ENE Port Isabel TX

Marine Point Forecast

[NOTICE]

Thursday
High: 82 °F
SSE 12kt
2ft
Thursday Night
Low: 80 °F
SSE 12kt
1-2ft
Friday
High: 83 °F
SSE 15kt
1-2ft
Friday Night
Low: 81 °F
SE 13kt
1-2ft
Saturday
High: 83 °F
SE 14kt
1ft
Saturday Night
Low: 79 °F
ESE 12kt
1-2ft
Sunday
High: 82 °F
SSE 9kt
1-2ft
Sunday Night
Low: 79 °F
E 8kt⇓
1ft
Memorial Day
High: 81 °F
⇑E 9kt
1-2ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 4:30 am CDT May 21, 2026
Forecast Valid: 4am CDT May 21, 2026-6pm CDT May 27, 2026

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Detailed Forecast

Thursday

SSE wind 8 to 12 kt becoming NNW in the morning. Showers and thunderstorms likely before 4pm, then a chance of showers. Seas around 2 ft.

Thursday Night

SSE wind 9 to 12 kt becoming SSW after midnight. A slight chance of showers and thunderstorms after 3am. Seas 1 to 2 ft.

Friday

SSE wind 10 to 15 kt. Mostly sunny. Seas 1 to 2 ft.

Friday Night

SE wind 11 to 13 kt. A slight chance of showers after 1am. Seas 1 to 2 ft.

Saturday

SE wind 11 to 14 kt. A chance of showers, with thunderstorms also possible after 10am. Seas around 1 ft.

Saturday Night

ESE wind 10 to 12 kt. Showers likely and possibly a thunderstorm before 10pm, then showers and thunderstorms likely between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Seas 1 to 2 ft.

Sunday

SSE wind 7 to 9 kt. Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Seas 1 to 2 ft.

Sunday Night

E wind 5 to 8 kt becoming variable and less than 5 kt after midnight. A chance of showers and thunderstorms. Seas around 1 ft.

Memorial Day

Variable winds less than 5 kt becoming E 5 to 9 kt in the morning. A chance of showers and thunderstorms. Seas 1 to 2 ft.

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.