Port Mansfield, TX to the Rio Grande River Marine Forecast
| Tonight...Southeast Winds 5 To 10 Knots, Becoming South After Midnight. Seas 1 To 2 Feet. Wave Detail: Southeast 2 Feet At 4 Seconds. |
| Thursday...South Winds 5 To 10 Knots, Diminishing To Around 5 Knots Late In The Morning, Then Becoming Southeast Early In The Afternoon, Increasing To 5 To 10 Knots Late In The Afternoon. Seas 1 To 2 Feet. Wave Detail: Southeast 1 Foot At 4 Seconds. |
| Thursday Night...Southeast Winds 5 To 10 Knots, Becoming South Early In The Morning. Seas 1 To 2 Feet. Wave Detail: Southeast 2 Feet At 3 Seconds. |
| Friday...South Winds 5 To 10 Knots, Becoming Southeast In The Afternoon. Seas 1 To 2 Feet. Wave Detail: Southeast 1 Foot At 4 Seconds. |
| Friday Night...Southeast Winds 5 To 10 Knots, Becoming South After Midnight. Seas 1 To 2 Feet. Wave Detail: Southeast 2 Feet At 4 Seconds. |
| Saturday...South Winds Around 5 Knots, Becoming Southeast In The Afternoon, Then Becoming East Late In The Afternoon. Seas 1 To 2 Feet. Wave Detail: Southeast 1 Foot At 5 Seconds. A Slight Chance Of Showers And Thunderstorms Until Late Afternoon. |
| Saturday Night...Southeast Winds Around 10 Knots, Becoming South After Midnight. Seas 2 To 3 Feet. |
| Sunday...South Winds Around 5 Knots, Becoming Southeast In The Afternoon. Seas 1 To 2 Feet. |
| Sunday Night...Southeast Winds 10 To 15 Knots, Becoming South Early In The Morning. Seas 2 To 3 Feet. |
| Monday...South Winds Around 10 Knots, Becoming Southeast Late In The Afternoon. Seas 2 To 3 Feet. |
| Monday Night...Southeast Winds 10 To 15 Knots, Becoming South Early In The Morning. Seas 2 To 4 Feet. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Brownsville TX 507pm CDT Wednesday August 26 2026 Issued at 130pm CDT Wednesday August 26 2026 Oppressive summertime heat will continue to be the main weather concern through early September across Deep South Texas as the region remains under the influence of strong high pressure aloft. Temperatures are running around 4-8 degrees above seasonal normals for mid to late August, with near record to record breaking temperatures forecast each afternoon. Widespread triple-digit high temperatures continue region wide through early next week, with the exception being along the immediate coast and islands… although highs will still be hot with highs in the 90s. In combination with elevated humidity, heat index values will range from 100-110 degrees each afternoon, with a few areas briefly reaching 111-112 degrees. To add to the oppressive daytime heat, nighttime temperatures also won’t provide much relief as it remains seasonably mild with lows in the upper 70s to around 80 degrees with heat indices briefly reaching the mid to upper 80s prior to sunrise. The combination of a prolonged period of triple- digit heat, mild nights, and humidity (among other factors), will result in a major (level 3 of 4) to extreme (level 4 of 4) heat risk for most of the week and into the weekend. Rain-free conditions unfortunately will continue across Deep South Texas as well. However, there's a glimmer of hope as some guidance indicates isolated showers or storms may develop along the sea breeze Friday through the weekend. Chances are still fairly low (around 10-25%), but we’ll take what we can get! Marine Issued at 130pm CDT Wednesday August 26 2026 Generally favorable marine conditions will continue through the forecast period with low seas and light to moderate southeasterly winds. Brief Small Craft Exercise Caution conditions cannot be ruled out across the Laguna Madre during the late afternoon hours, with occasional gusts near 15-20 knots. NOAA Brownsville TX Office: Watches - Warnings - Advisories TX...None. GM...None. |
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