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 605 AM CDT Tue Aug 4 2026
- Heat Indices between 105-110F, and locally higher, are expected each day. Heat Advisories may be needed.
- Moderate (level 2 out of 4) to Major (level 3 out of 4) Heat Risk will continue into next week.
- There is a low (10 to 20 percent) chance of isolated showers and thunderstorms along the sea breeze each afternoon, especially late week through the weekend.
DISCUSSION
Issued at 1012 PM CDT Mon Aug 3 2026
The persistent ridge of high pressure across the Desert SW strengthens through the week, allowing weaker pressure to gradually build along the coast late week through the weekend, increasing humidity. This will maintain above normal temperatures across Deep South Texas through the forecast period with a low (less than 10 to 20 percent) chance of showers or thunderstorms along the sea breeze each afternoon Thursday through next Monday.
The highest Heat Indices are expected to occur behind the sea breeze each afternoon as it increases humidity from east to west, nearing or briefly topping 110 degrees, potentially just reaching or falling shy of Heat Advisory criteria. There is a Moderate (level 2 of 4) to Major (level 3 of 4) Heat Risk each afternoon with little to no relief each night.
AVIATION
(12Z TAFS) Issued at 605 AM CDT Tue Aug 4 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 1012 PM CDT Mon Aug 3 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 82 97 81 / 0 0 0 0 HARLINGEN 100 78 100 78 / 0 0 0 0 MCALLEN 101 82 102 81 / 0 0 0 0 RIO GRANDE CITY 102 79 102 79 / 0 0 0 0 SOUTH PADRE ISLAND 89 81 89 81 / 0 0 0 0 BAYVIEW/PORT ISABEL 96 80 96 79 / 0 0 0 0
BRO WATCHES/WARNINGS/ADVISORIES
None.
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