textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 1238 PM CDT Mon Jun 29 2026

* Hot conditions continue through the next. Heat indices between 100 and 110 degrees this week will lead to Moderate (level 2 of 4) Heat Risk each day.

* Generally rain free conditions are expected, though could see some isolated sea breeze activity mid to late week.

* There is a Moderate Risk of life-threatning rip currents at area beaches through at least tonight.

DISCUSSION

Issued at 1238 PM CDT Mon Jun 29 2026

Hot and rain free conditions will prevail across Deep South Texas and the Rio Grande Valley this week. Mid-level ridging will remain in place with high pressure centered over the eastern US. Afternoon temperatures will rise to the mid to upper 90s each day, with a few triple digits possible across the upper Valley/Rio Grande Plains. Heat indices will be generally between 100 and 110 degrees each day, thus no heat advisories are anticipated at this time. This will also maintain generally a Moderate Heat Risk (level 2 of 4) each day over the next week.

Breezy conditions will continue through today due to an enhanced surface pressure gradient. Today expect winds of 20-25 mph with gusts up to 35 mph, especially along the coast and into the Mid- Valley. As we head into Tuesday the gradient will begin to relax, thus decreasing wind speeds/gusts.

As we head into midweek, a slight breakdown in the ridge over southern Texas will allow for the return of afternoon seabreeze activity. Chances remain at around 15% or less Wednesday through Friday.

NASA/GMAO aerosol forecasts indicate a plume of Saharan dust intruding over deep South Texas through today, which will lead to poor air quality that is unhealthy to sensitive groups.

The rip current risk will remain moderate at least through tonight but may persist through the week. Moderate to strong longshore currents will continue into Tuesday and can quickly push swimmers up the beach and into rip currents. For more information you can visit www.weather.gov/bro/surfmatrices.

AVIATION

(18Z TAFS) Issued at 1207 PM CDT Mon Jun 29 2026

VFR conditions will prevail through the TAF period. Gusty southeasterly winds to around 30 kts are expected today, decreasing tonight. Winds will be a bit more moderate on Tuesday with gusts to 25 kts.

MARINE

Issued at 1238 PM CDT Mon Jun 29 2026

An slightly enhanced surface gradient will lead to slightly adverse marine conditions through the remainder of today. Small Craft will need to exercise caution on the Laguna Madre and Gulf waters. As the gradient relaxes winds will decrease and favorable conditions will return. Generally seas of 2 to 3 feet are expected with 5 to 6 second periods.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 79 94 80 93 / 0 0 0 10 HARLINGEN 76 95 77 95 / 0 0 0 10 MCALLEN 79 99 79 97 / 0 0 0 10 RIO GRANDE CITY 77 99 76 98 / 0 0 0 0 SOUTH PADRE ISLAND 81 87 81 87 / 0 0 10 0 BAYVIEW/PORT ISABEL 78 91 78 91 / 0 0 0 10

BRO WATCHES/WARNINGS/ADVISORIES

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