textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 1241 AM CDT Mon Sep 7 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.

- Showers and thunderstorms, especially along the seabreeze, are possible each afternoon into next week.

- Low risk of rip currents are expected at area beaches.

DISCUSSION

Issued at 1005 PM CDT Sun Sep 6 2026

Hot temperatures will continue to be the main focus through the forecast period. For the remainder of the Labor Day weekend and into next week, most inland locations will continue to see afternoon highs in triple digits with locations right along the coast remaining in the 90s. Heat indices of 105-110 degrees are expected across the region each afternoon with some locations briefly exceeding 111 degrees. While we generally expect to remain just shy of Heat Advisory criteria each day, Tuesday looks to be the best likelihood for any potential Heat Advisory.

Rain chances will continue into the middle of the week with a 10-25% chance most days, primarily along the sea breeze. Best chance of rain will be on Wednesday where chances increase to 30-40%. Any convection that does develop could produce locally heavy rain, gusty winds, and cloud to ground lighting.

While there is a low risk of rip currents at area beaches, life threatening rips currents often occur near jetties and piers. Use caution if entering the water.

AVIATION

(06Z TAFS) Issued at 1241 AM CDT Mon Sep 7 2026

Predominately VFR conditions are forecast to continue through the period, however, there is a low (<20%) chance for isolated showers and thunderstorms along the sea breeze early Monday afternoon. Light southeasterly winds are forecast to continue through the morning, with winds increasing and shifting more easterly Monday afternoon.

MARINE

Issued at 1005 PM CDT Sun Sep 6 2026

Generally favorable conditions will prevail. Expect light to moderate southeasterly winds with seas around 2 ft and 5 second periods. Daily chances of showers and thunderstorms could lead to locally enhanced winds and seas.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 98 81 98 80 / 10 0 20 0 HARLINGEN 101 77 101 76 / 20 0 20 0 MCALLEN 103 81 103 80 / 20 0 0 0 RIO GRANDE CITY 103 79 103 78 / 10 0 0 0 SOUTH PADRE ISLAND 90 82 90 81 / 10 0 10 10 BAYVIEW/PORT ISABEL 96 79 96 78 / 10 0 20 0

BRO WATCHES/WARNINGS/ADVISORIES

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