Port Mansfield, TX to the Rio Grande River Marine Forecast
| Tonight...East Winds 5 To 10 Knots, Becoming Southeast After Midnight. Seas 2 To 3 Feet. Wave Detail: East 2 Feet At 6 Seconds. |
| Wednesday...Northeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: East 2 Feet At 5 Seconds. |
| Wednesday Night...East Winds 5 To 10 Knots, Becoming Southeast After Midnight. Seas 2 To 3 Feet. Wave Detail: East 2 Feet At 5 Seconds. |
| Thursday...Northeast Winds 5 To 10 Knots. Seas 1 To 2 Feet. Wave Detail: Northeast 2 Feet At 5 Seconds. A Slight Chance Of Showers. |
| Thursday Night...East Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: East 2 Feet At 5 Seconds. A Slight Chance Of Showers Early In The Evening. A Slight Chance Of Showers After Midnight. |
| Friday...Northeast Winds 5 To 10 Knots, Increasing To 10 To 15 Knots In The Afternoon. Seas 2 To 3 Feet. Wave Detail: East 2 Feet At 5 Seconds. A Chance Of Showers. A Slight Chance Of Thunderstorms In The Afternoon. |
| Friday Night...Northeast Winds 10 To 15 Knots, Diminishing To 5 To 10 Knots After Midnight. Seas 2 To 3 Feet. Showers Likely With A Slight Chance Of Thunderstorms. |
| Saturday...Northeast Winds 5 To 10 Knots. Seas 2 To 4 Feet. A Slight Chance Of Thunderstorms In The Morning. Showers Likely. A Chance Of Thunderstorms In The Afternoon. |
| Saturday Night...East Winds 5 To 10 Knots. Seas 3 To 5 Feet. A Chance Of Showers. A Chance Of Thunderstorms Early In The Evening. A Slight Chance Of Thunderstorms After Midnight. |
| Sunday...East Winds 5 To 10 Knots. Seas 3 To 4 Feet. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Sunday Night...East Winds Around 10 Knots, Becoming Southeast After Midnight. Seas 3 To 4 Feet. A Chance Of Showers With A Slight Chance Of Thunderstorms Early In The Evening, Then A Slight Chance Of Showers Late In The Evening. A Chance Of Showers After Midnight. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Brownsville TX 114pm CDT Tuesday September 30 2025 ...New KEY MESSAGES... .KEY MESSAGES... Updated at 114pm CDT Tuesday September 30 2025 - Low to medium (20-50%) rain chances return Friday through early next week, mainly along and east of US-281. - Near normal temperatures continue with highs mostly in the low to mid 90s. - A Moderate risk of rip currents is likely by the end of the week and into the weekend. Issued at 1235pm CDT Tuesday September 30 2025 Ridging aloft will prevail through at least Thursday across Deep South Texas, which will result in generally rain-free conditions and seasonable temperatures. By Friday and the weekend, the ridge is expected to shift further west as an upper level trough and mid level low set up over the Southeast US and Gulf Coast. We’ll also start to see an increase in precipitable water values (around 1.4-1.6 inches), although there are still discrepancies among deterministic and ensemble guidance. This set up should allow for daily low to medium (20-40%) rain chances along/east of US-281 as the sea breeze moves inland. Heading into early next week, there are some indications among guidance that precipitable water values will increase around or above 1.6-1.7 inches, which may support some locally heavy rain with any activity that develops next week. The uptick in humidity will result in heat index values just around 100 degrees Sunday into early next week. For the Lower Texas beaches, the current forecast remains at a low risk of rip currents through at least tomorrow evening. However, a moderate risk of rip currents is expected heading into the weekend. Marine Issued at 1235pm CDT Tuesday September 30 2025 Generally favorable marine conditions will prevail with light to moderate winds and low to moderate seas. Low to medium (20-60%) rain chances return Friday through the weekend and into early next week. Locally enhanced winds and seas will be possible within any activity. NOAA Brownsville TX Office: Watches - Warnings - Advisories TX...None. GM...None. |
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