textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 530 PM CDT Sat Aug 29 2026

- Hot temperatures, near record to record-breaking, are expected to continue into Labor Day weekend.

- Widespread Major (Level 3 of 4) to Extreme (Level 4 of 4) Heat Risk is expected.

- Isolated sea breeze showers and thunderstorms cannot be ruled out each day.

DISCUSSION

Issued at 135 PM CDT Sat Aug 29 2026

Heat will continue to be the main weather concern heading into early September across Deep South Texas as the region remains under influence of high pressure aloft. Although the ridge aloft is expected to shift towards the Southern Plains, we'll still maintain near record to record-breaking triple digit high temperatures each afternoon heading into Labor Day weekend. Expect highs each afternoon to range from 95-103 degrees along and east of US-281, and closer to 103-107 degrees west of US-281. Persistent low level southerly to southeasterly flow will maintain elevated humidity, mainly along and east of US-281, allowing for heat indices to reach the 109-112 range each afternoon. This will result in a major (level 3 of 4) to extreme (level 4 of 4) heat risk across Deep South Texas. Continue to practice heat safety to prevent heat-related illnesses and always look before you lock your car! Most of the week is expected to remain rain-free, but some isolated sea breeze activity cannot be ruled out with daily rain chances near or below 10-15%.

AVIATION

(00Z TAFS) Issued at 530 PM CDT Sat Aug 29 2026

Through 00z Monday....VFR conditions will prevail through the 00z TAF cycle. There is a chance for showers and thunderstorms along the sea breeze Sunday afternoon/evening. Given how low the chances are and how isolated and scattered in coverage they will be, have not included showers and thunderstorms in the TAFs at this time.

Southeast winds 10-15 kts with gusts between 20-25 kts will subside later this evening. Tonight, winds will trend towards light and variable. On Sunday, the southeasterly component will pick back up with speeds between 10-15 kts with gusts as high as 20 kts or so.

MARINE

Issued at 135 PM CDT Sat Aug 29 2026

Generally favorable marine conditions will continue through the forecast period with low seas and light to low to moderate southeasterly to easterly winds. However, locally higher winds and seas cannot be ruled out near any showers or thunderstorms. The best chances for showers and thunderstorms are mainly over the offshore Gulf waters this weekend and early next week. Otherwise,brief Small Craft Exercise Caution conditions cannot be ruled out across the Laguna Madre during the late afternoon hours, with occasional gusts near 15-20 knots.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 80 97 81 98 / 10 10 0 0 HARLINGEN 76 101 77 101 / 0 10 0 10 MCALLEN 80 103 81 103 / 0 10 0 0 RIO GRANDE CITY 78 104 79 104 / 10 0 0 0 SOUTH PADRE ISLAND 81 89 81 90 / 10 10 0 0 BAYVIEW/PORT ISABEL 79 96 79 96 / 0 10 0 0

BRO WATCHES/WARNINGS/ADVISORIES

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