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 606 AM CDT Wed Aug 5 2026

- Heat Indices between 105-110F, and locally higher, are expected each afternoon. Heat Advisories may be needed. - Moderate (level 2 out of 4) to Major (level 3 out of 4) Heat risk will continue through at least Thursday.

- Low (less than 25 percent) chance of isolated showers and thunderstorms along the sea breeze each afternoon.

DISCUSSION

Issued at 1003 PM CDT Tue Aug 4 2026

The persistent ridge of high pressure across the Desert SW strengthens through the week, allowing weaker pressure and moisture to settle along the coast. Expect warm and breezy conditions to continue with above normal temperatures across Deep South Texas through the forecast period. There is a low (25 percent or less) chance of showers or thunderstorms along the sea breeze each afternoon into next week.

The highest Heat Indices each afternoon are expected to range from 105 to 110 degrees, with a few locations briefly topping 111 degrees behind the sea breeze each afternoon. Heat Advisories may be needed. There is a Moderate (level 2 of 4) to Major (level 3 of 4) Heat Risk each afternoon, especially through Thursday, with little to no relief each night.

AVIATION

(12Z TAFS) Issued at 606 AM CDT Wed Aug 5 2026

MVFR to VFR will prevail at the aerodromes through the next 24 hours. Generally partly cloudy skies will be accompanied by light winds at night and breezy winds during the daytime with higher gusts.

MARINE

Issued at 1003 PM CDT Tue Aug 4 2026

Light to moderate southeasterly winds continue generally favorable marine conditions along the lower Texas coast with seas of 3 feet or less. Periodic Small Craft Caution conditions are expected along the bay each afternoon due to southeasterly wind gusts.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 97 81 97 80 / 10 0 10 0 HARLINGEN 99 78 100 77 / 10 0 10 0 MCALLEN 102 81 103 80 / 0 0 10 0 RIO GRANDE CITY 102 79 103 78 / 0 0 0 0 SOUTH PADRE ISLAND 89 81 89 81 / 10 10 0 0 BAYVIEW/PORT ISABEL 96 80 96 79 / 0 10 10 0

BRO WATCHES/WARNINGS/ADVISORIES

None.

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