Coastal Waters Forecast for Waters from Port Mansfield TX to the Rio Grande River from 20 to 60 NM (GMZ170) (Text-Only)
NWS Forecast for: Waters from Port Mansfield TX to the Rio Grande River from 20 to 60 NM (GMZ170)
Issued by: National Weather Service Brownsville, TX
Last Update: 1247 PM CST Sat Dec 6 2025
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Tonight: East winds 5 to 10 knots, becoming south early this morning. Seas 2 to 3 feet. Wave detail: east 2 feet at 5 seconds. A slight chance of showers this evening. A slight chance of showers early this morning.

Sunday: Southwest winds 5 to 10 knots, becoming northwest late in the afternoon. Seas 1 to 2 feet. Wave detail: northwest 2 feet at 3 seconds and east 2 feet at 5 seconds. A slight chance of showers until late afternoon.

Sunday Night: North winds 10 to 15 knots, increasing to 20 to 25 knots with gusts up to 30 knots. Seas 3 to 5 feet, building to 6 to 9 feet, occasionally to 11 feet after midnight. Wave detail: north 4 feet at 4 seconds, becoming north 9 feet at 6 seconds.

Monday: North winds 20 to 25 knots, diminishing to 15 to 20 knots in the afternoon. Seas 6 to 9 feet, occasionally to 11 feet, subsiding to 5 to 7 feet, occasionally to 9 feet in the afternoon. Wave detail: north 9 feet at 7 seconds, becoming northeast 6 feet at 7 seconds.

Monday Night: Northeast winds 10 to 15 knots. Seas 3 to 5 feet. Wave detail: northeast 5 feet at 7 seconds.

Tuesday: East winds 5 to 10 knots, becoming around 5 knots in the afternoon. Seas 2 to 3 feet. Wave detail: northeast 3 feet at 6 seconds.

Tuesday Night: Southeast winds around 10 knots, becoming south after midnight. Seas 2 to 3 feet.

Wednesday: South winds 10 to 15 knots. Seas 2 to 3 feet.

Wednesday Night: South winds 10 to 15 knots. Seas 2 to 4 feet.

Thursday: South winds 10 to 15 knots. Seas 3 to 4 feet.

Thursday Night: South winds 10 to 15 knots, becoming southeast early in the morning. Seas 3 to 4 feet.







Zone Forecast: Waters from Port Mansfield TX to the Rio Grande River from 20 to 60 NM (GMZ170)

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