textproduct: Brownsville/Rio Grande Valley

This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

KEY MESSAGES

Updated at 1204 PM CDT Tue Aug 4 2026

- Heat Indices between 105-110F are expected each day, potentially higher. Heat Advisories may be needed.

- Moderate (level 2 out of 4) to Major (level 3 out of 4) Heat risk will continue through Thursday.

- Low chance of isolated showers and thunderstorms along the sea breeze each afternoon, mainly late week through the weekend.

DISCUSSION

Issued at 1204 PM CDT Tue Aug 4 2026

Hot temperatures will continue plague Deep South Texas and the Rio Grande Valley through the forecast period as high pressure remains over the southwestern US. Temperatures each day will rise into the upper 90s to low 100s with heat indices between 105-110F expected. While we look to remain just shy of Heat Advisory criteria each day, a few locations may briefly exceed 111F. There is a Moderate (level 2 of 4) to Major (level 3 of 4) Heat Risk every afternoon through Thursday.

Dry conditions will prevail through much of the period. With that said, there does remain a low chance (less than 20%) of an isolated shower or thunderstorms each afternoon along the seabreeze, mainly late week into the weekend. Any showers or thunderstorms that do develop could produce gusty winds, lightning, and brief heavy rainfall.

AVIATION

(18Z TAFS) Issued at 1204 PM CDT Tue Aug 4 2026

VFR conditions will prevail at all aerodromes. Southeasterly winds will gust to around 25 kts through this afternoon before decreasing this evening and overnight.

MARINE

Issued at 1204 PM CDT Tue Aug 4 2026

An enhanced pressure gradient along the immediate coast could result in periodic Small Craft Exercise Caution conditions along the Laguna Madre. Otherwise, expect light to moderate southeasterly winds with 2 to 3 ft seas and 5 to 6 second periods.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 81 96 81 97 / 0 0 10 10 HARLINGEN 78 99 78 100 / 0 0 0 10 MCALLEN 81 102 81 102 / 0 0 0 10 RIO GRANDE CITY 79 102 79 103 / 0 0 0 10 SOUTH PADRE ISLAND 81 89 81 89 / 0 0 10 10 BAYVIEW/PORT ISABEL 80 95 79 96 / 0 0 0 10

BRO WATCHES/WARNINGS/ADVISORIES

TX...None. GM...None.


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