Baffin Bay to Port Mansfield, TX 20 - 60 NM Marine Forecast
| Tonight...Southeast Winds 5 To 10 Knots, Becoming South After Midnight. Seas 1 To 2 Feet. |
| Friday...South Winds 5 To 10 Knots, Becoming Southeast Early In The Afternoon, Then Becoming East Around 5 Knots Late In The Afternoon. Seas 1 To 2 Feet. |
| Friday Night...Southeast Winds 5 To 10 Knots, Becoming South After Midnight. Seas 1 To 2 Feet. A Slight Chance Of Showers And Thunderstorms After Midnight. |
| Saturday...South Winds Around 5 Knots, Becoming Southeast In The Afternoon. Seas 1 To 2 Feet. A Slight Chance Of Showers And Thunderstorms Until Late Afternoon. |
| Saturday Night...Southeast Winds 5 To 10 Knots, Becoming South After Midnight. Seas 2 To 3 Feet. A Slight Chance Of Showers And Thunderstorms After Midnight. |
| Sunday...South Winds 5 To 10 Knots, Becoming Southeast Late In The Afternoon. Seas 2 To 3 Feet. A Slight Chance Of Showers And Thunderstorms Until Late Afternoon. |
| Sunday Night...Southeast Winds 10 To 15 Knots, Becoming South Early In The Morning. Seas 2 To 4 Feet. |
| Monday...South Winds Around 10 Knots. Seas 2 To 3 Feet. A Slight Chance Of Showers And Thunderstorms In The Morning. |
| Monday Night...Southeast Winds 10 To 15 Knots. Seas 2 To 4 Feet. |
| Tuesday...Southeast Winds 5 To 10 Knots. Seas 2 To 4 Feet. A Slight Chance Of Showers And Thunderstorms Until Late Afternoon. |
| Tuesday Night...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet. A Slight Chance Of Showers And Thunderstorms After Midnight. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion ...UPDATED National Weather Service Brownsville TX 1242am CDT Fri August 28 2026 Issued at 1001pm CDT Thu August 27 2026 A broad and strong 591-594 dam sub-tropical heat dome will continue to yield hotter than normal temperatures through the middle parts of next week or into early September across Deep South Texas and the Rio Grande Valley. Record to near record-breaking temperatures are possible on Friday (see CLIMATE SECTION). This heat dome will weaken some and begin shifting eastward from the 4-Corners Region to the southern Plains and Mid-South this weekend into next week. Given the situation, widespread triple digit heating including over Harlingen and Brownsville will still be possible through at least parts of the forecast period. Given the fact that climatologically we are in the hottest part of the year (i.e. average high temperature for McAllen is 100F degrees) and yet forecasted temperatures are projected to be 3-6F degrees hotter than the climatological peak temperatures will continue to result in dangerously hot conditions even for the RGV's standards in the days ahead. That said, widespread Major (Level 3 of 4) with areas of Extreme (Level 4 of 4) Heat Risk is expected to prevail through mid next week. The combination of very hot temperatures and dry conditions will continue to result in very strong evaporation rates. This will lead to a continuation of worsening or expanding drought conditions across Deep South Texas and Rio Grande Valley during this stretch. A couple of models continue to hint at the potential for showers and thunderstorms along the sea breeze Friday through Sunday. Chances continue to remain low ranging between 20-30% with the best chances being along and east of IH-69C/US-281. Marine Issued at 1001pm CDT Thu August 27 2026 Favorable marine conditions are expected to continue through mid next week with low to moderate seas (1 to 3 foot wave heights) and light to moderate southeasterly winds. Climate Issued at 1001pm CDT Thu August 27 2026 A massive and strong 591-594 dam heat dome situated over the Southwest U.S. and the Southern Plains will continue to result in record to near record-breaking temperatures through Friday. Daytime high temperature anomalies are expected to run 4-8F degrees above normal levels during this timeframe. Below is a list of record highs for August 28: Friday August 28th, 2026 Brownsville: 106F in 2023 Harlingen: 106F in 2011 McAllen: 107F in 2023 NOAA Brownsville TX Office: Watches - Warnings - Advisories None. |
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