textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 1034 PM CDT Sun Jul 26 2026

- A warming trend will result in widespread triple-digit temperatures and heat index values through the end of July and into early August. - The combination of above normal temperatures and high humidity will result in a moderate to major heat risk this week.

- A moderate risk of rip currents along the lower Texas beaches through Monday evening.

DISCUSSION

Issued at 1034 PM CDT Sun Jul 26 2026

Hot temperatures and rain free conditions are forecast to continue through the period. An upper-level ridge over the Central US looks to remain in place through the week, resulting in broad subsidence and dry mid levels across Texas. This will generally support sunny to mostly sunny skies through the week, though some low cumulus will be possible during the early mornings. Southeasterly surface winds will continue to advect additional hot air and moisture to the region. Combined with the daytime heating, this will support high temperatures in the triple-digits across most of Deep South Texas this week.

The combination of hot temperatures and humid air will likely result in Major Heat Risk (level 3 of 4) across most of Deep South Texas this week, with portions of the Rio Grande Valley and Coastal Plains possibly reaching Extreme Heat Risk (level 4 of 4) in the later half of the week. Heat index values are forecast to generally peak around 110-115 degrees each afternoon. Drier air over portions of Zapata and Jim Hogg counties may keep Heat index values slightly lower, in spite of the higher air temperatures. Heat Advisories will become increasingly likely as the week progresses, primarily across the coastal counties and the Rio Grande Valley.

AVIATION

(00Z TAFS) Issued at 642 PM CDT Sun Jul 26 2026

VFR conditions are forecast to continue through the period. Southeasterly winds are forecast to become light overnight, with wind gusts and speeds increasing Monday afternoon. Skies are forecast to remain clear to mostly clear through the period.

MARINE

Issued at 1034 PM CDT Sun Jul 26 2026

Adverse marine conditions are anticipated daily through the week. Wind speeds along the Lower Texas Coast are forecast to increase each afternoon and Small Craft Should Exercise Caution headlines will likely be needed for the Laguna Madre and Gulf waters.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 80 97 81 96 / 0 0 0 0 HARLINGEN 76 100 78 99 / 0 0 0 0 MCALLEN 79 103 80 102 / 0 0 0 0 RIO GRANDE CITY 77 104 78 103 / 0 0 0 0 SOUTH PADRE ISLAND 81 89 81 88 / 0 0 0 0 BAYVIEW/PORT ISABEL 78 96 79 95 / 0 0 0 0

BRO WATCHES/WARNINGS/ADVISORIES

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