Coastal Waters Forecast for Coastal waters from Port Mansfield TX to the Rio Grande River out 20 NM (GMZ150) (Text-Only)
NWS Forecast for: Coastal waters from Port Mansfield TX to the Rio Grande River out 20 NM (GMZ150)
Issued by: National Weather Service Brownsville, TX
Last Update: 146 PM CDT Sun Oct 18 2026


Tonight: Northeast winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas 3 to 5 feet. Wave detail: northeast 5 feet at 9 seconds. A slight chance of showers early this evening.

Monday: Northeast winds 10 to 15 knots. Seas 3 to 5 feet. Wave detail: east 5 feet at 8 seconds. A slight chance of showers late in the morning. A chance of showers in the afternoon.

Monday Night: Northeast winds 10 to 15 knots. Seas 4 to 5 feet. Wave detail: east 5 feet at 8 seconds. A slight chance of showers early in the evening. A slight chance of showers after midnight.

Tuesday: Northeast winds 10 to 15 knots. Seas 4 to 5 feet. Wave detail: east 5 feet at 8 seconds. A chance of showers.

Tuesday Night: Northeast winds 10 to 15 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave detail: east 5 feet at 8 seconds. A chance of showers. A slight chance of thunderstorms after midnight.

Wednesday: Northeast winds around 10 knots. Seas 4 to 5 feet. Wave detail: east 5 feet at 8 seconds. A slight chance of thunderstorms. A chance of showers until late afternoon, then a slight chance of showers late in the afternoon.

Wednesday Night: East winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas 4 to 5 feet. A slight chance of showers and thunderstorms early in the evening.

Thursday: Northeast winds 5 to 10 knots. Seas 3 to 4 feet.

Thursday Night: East winds around 10 knots, becoming 5 to 10 knots after midnight. Seas 3 to 4 feet.

Friday: East winds 5 to 10 knots. Seas 2 to 3 feet.

Friday Night: Southeast winds around 10 knots. Seas 2 to 4 feet.

winds and seas higher in and near thunderstorms.







Zone Forecast: Coastal waters from Port Mansfield TX to the Rio Grande River out 20 NM (GMZ150)

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