textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 1239 AM CDT Fri Sep 4 2026

- Major (level 3 of 4) to Extreme (level 4 of 4) Heat Risk is expected throughout much of Deep South Texas through next week.

- A combination low afternoon relative humidity, dry grasses, and hot temperatures may raise concerns for favorable fire weather through Friday.

- Sea breeze showers and thunderstorms east of I-69C are possible each afternoon Labor Day Weekend and continuing into early next week.

DISCUSSION

Issued at 1007 PM CDT Thu Sep 3 2026

Will continue to see hot temperatures through this weekend with afternoon highs reaching into the triple digits for most locations. Current heat indices may remain just shy of Heat Advisory criteria for Friday, but will continue to monitor. Temperatures will remain in the upper 90s to low triple digits next week. A major (level 3 of 4) to Extreme (level 4 of 4) Heat Risk will continue in next week. If spending time outdoors, continue to practice heat safety to prevent heat related illnesses.

The good news? Some rain chances return to the forecast Saturday through Thursday, mainly along I-69C and eastward, associated with the seabreeze. Best chances will be on Tuesday and Wednesday (10-40%), though will see low chances (10-30%) for the Labor Day weekend. Rain chances could potentially help cool things off in a few locations as well.

Will continue to see the potential for rapid wildfire spread through Friday due to dry conditions and slightly elevated winds. Outdoor burning is not recommended.

AVIATION

(06Z TAFS) Issued at 1239 AM CDT Fri Sep 4 2026

VFR is anticipated at the aerodromes through the next 24 hours. Light winds for the remainder of the overnight hours will become breezy on Friday with stronger gusts before diminishing around sunset. Generally partly cloudy skies will prevail with non-free skies.

MARINE

Issued at 1007 PM CDT Thu Sep 3 2026

While generally favorable conditions will prevail, a slightly enhanced pressure gradient along the immediate coast may result in brief Small Craft Exercise Caution conditions on Friday along the Laguna Madre. Otherwise, expect light to moderate southeasterly winds with 2 to 3 ft seas and 5 to 6 second periods.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 99 81 98 81 / 0 0 10 0 HARLINGEN 102 77 101 77 / 0 0 20 0 MCALLEN 104 82 103 81 / 0 0 20 10 RIO GRANDE CITY 105 80 103 79 / 0 0 10 20 SOUTH PADRE ISLAND 90 82 90 82 / 0 0 10 0 BAYVIEW/PORT ISABEL 97 79 96 79 / 0 0 10 0

BRO WATCHES/WARNINGS/ADVISORIES

None.