textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 1204 PM CDT Mon Jul 27 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

(18Z TAFS) Issued at 1204 PM CDT Mon Jul 27 2026

VFR conditions will prevail during the TAF period. Southeasterly winds will gust up to 25 kts this afternoon, decreasing overnight.

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 81 96 82 97 / 0 0 0 0 HARLINGEN 78 99 79 100 / 0 0 0 0 MCALLEN 80 102 81 103 / 0 0 0 0 RIO GRANDE CITY 78 104 80 104 / 0 0 0 0 SOUTH PADRE ISLAND 81 88 82 89 / 0 0 0 0 BAYVIEW/PORT ISABEL 79 95 80 95 / 0 0 0 0

BRO WATCHES/WARNINGS/ADVISORIES

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