Port Mansfield, TX to the Rio Grande River Marine Forecast
| Tonight...Southeast Winds Around 20 Knots. Seas 5 To 7 Feet, Occasionally To 9 Feet. Wave Detail: Southeast 6 Feet At 7 Seconds. |
| Monday...Southeast Winds 15 To 20 Knots. Seas 5 To 7 Feet, Occasionally To 9 Feet. Wave Detail: Southeast 6 Feet At 8 Seconds. |
| Monday Night...Southeast Winds 15 To 20 Knots. Seas 5 To 7 Feet, Occasionally To 9 Feet. Wave Detail: Southeast 6 Feet At 8 Seconds. |
| Tuesday...Southeast Winds 10 To 15 Knots. Seas 5 To 7 Feet, Occasionally To 9 Feet, Subsiding To 4 To 5 Feet In The Afternoon. Wave Detail: Southeast 6 Feet At 8 Seconds, Becoming Southeast 5 Feet At 8 Seconds. |
| Tuesday Night...Southeast Winds 10 To 15 Knots. Seas 4 To 5 Feet. Wave Detail: Southeast 5 Feet At 8 Seconds. A Chance Of Showers And Thunderstorms After Midnight. |
| Wednesday...Southeast Winds 10 To 15 Knots. Seas 4 To 5 Feet. Wave Detail: Southeast 5 Feet At 8 Seconds. A Chance Of Thunderstorms Early In The Morning. A Chance Of Showers Until Late Afternoon. A Slight Chance Of Thunderstorms Late In The Morning. |
| Wednesday Night...Southeast Winds 10 To 15 Knots. Seas 3 To 5 Feet. |
| Thursday...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet. A Chance Of Showers. A Slight Chance Of Thunderstorms Until Late Afternoon, Then A Chance Of Thunderstorms Late In The Afternoon. |
| Thursday Night...Southeast Winds 10 To 15 Knots, Becoming South Early In The Morning. Seas 3 To 4 Feet. A Chance Of Thunderstorms. A Chance Of Showers In The Evening, Then Showers Likely After Midnight. |
| Friday...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet. A Chance Of Showers And Thunderstorms. |
| Friday Night...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet. A Chance Of Showers In The Evening. A Chance Of Thunderstorms. Showers Likely After Midnight. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Brownsville TX 1251pm CDT Sunday May 17 2026 Issued at 1232pm CDT Sunday May 17 2026 An unsettled weather pattern should set up over Deep South Texas and the Rio Grande Valley over through the majority of the forecast period. As the upper-level flow pattern of southwesterly flow will allow for daily convection to flare up over the Sierra Madre, there is a chance that these thunderstorms could move into the CWA (County Warning Area) each day. While the confidence is low at this time, thus Probability of Precipitation has been generally limited to around 20%. However, by the end of the week, the environment does become more favorable for the development of showers and thunderstorms are a frontal boundary stalls to the north of the area and allows for moisture to pool in the region. Thus rain chances increase to medium (around 50-60%) for Thursday and Friday. As for the temperatures, the highs for today through Tuesday are expected to be in the upper 90s to lower triple digits. The heat indices are expected to be around 108 for each of those days as well. Thus the heat risk for this time period is a mixture of moderate (level 2 of 4) to major (level 3 of 4). However by Wednesday, the temperatures do lower a bit as more clouds build into the region with the expected increase in rain chances. Lastly, along the Lower Texas Coast, there is a moderate risk of rip currents today and tonight with a High Risk of Rip Currents starting tomorrow. There is a slight chance for some minor coastal flooding Marine Issued at 1232pm CDT Sunday May 17 2026 With the pressure gradient tightening over the Lower Texas waters, Small Craft Advisory is currently in place through 9am Monday, but could be extended even further as hazardous conditions could persist. The southeasterly winds are expected to be around 20 to 25 knots through much of the period. NOAA Brownsville TX Office: Watches - Warnings - Advisories TX...High Rip Current Risk from Monday morning through Monday evening for TXZ451-454-455. GM...Small Craft Advisory until 9am CDT Monday for GMZ130-132-135- 150-155-170-175. |
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