Last Update: 135 AM CDT Sat Apr 18 2026

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Brownsville, TX Local Forecast Office

46NM ENE Port Isabel TX

Marine Zone Forecast


Today
Southeast winds 10 to 15 knots, becoming east late this afternoon. Seas 4 to 5 feet. Wave detail: southeast 5 feet at 7 seconds.
Tonight
East winds around 10 knots, becoming northeast after midnight, then increasing to 15 to 20 knots early in the morning. Seas 3 to 4 feet. Wave detail: southeast 4 feet at 7 seconds and southeast 2 feet at 3 seconds. A slight chance of showers in the evening. A slight chance of thunderstorms in the late evening and overnight. Showers after midnight.
Sunday
Northeast winds 20 to 25 knots. Seas 6 to 8 feet, occasionally to 10 feet. Wave detail: northeast 7 feet at 7 seconds and north 2 feet at 4 seconds. A slight chance of thunderstorms. Showers.
Sunday Night
Northeast winds 15 to 20 knots. Seas 6 to 8 feet, occasionally to 10 feet. Wave detail: northeast 7 feet at 7 seconds. Showers likely with a slight chance of thunderstorms in the evening, then a chance of showers and thunderstorms after midnight.
Monday
East winds around 15 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave detail: east 5 feet at 7 seconds. Showers likely.
Monday Night
East winds 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave detail: east 5 feet at 7 seconds. A chance of thunderstorms. Showers likely early in the evening, then a chance of showers in the late evening and overnight.
Tuesday
Southeast winds 10 to 15 knots. Seas 4 to 6 feet, occasionally to 8 feet. A chance of showers with a slight chance of thunderstorms.
Tuesday Night
Southeast winds 10 to 15 knots. Seas 4 to 5 feet. A slight chance of thunderstorms. A chance of showers early in the evening, then a slight chance of showers in the late evening and overnight.
Wednesday
Southeast winds around 10 knots. Seas 3 to 4 feet. A slight chance of thunderstorms early in the morning. A slight chance of showers.
Wednesday Night
Southeast winds 10 to 15 knots. Seas 3 to 5 feet. A slight chance of showers early in the evening.

winds and seas higher in and near thunderstorms.




Winds and seas higher in and near thunderstorms.
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135 AM CDT Sat Apr 18 2026
 
 

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