textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 621 AM CDT Tue Jun 30 2026

* Hot conditions continue through the week. 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.

DISCUSSION

Issued at 1045 PM CDT Mon Jun 29 2026

Hot, dry conditions continue through the forecast under broad mid- level ridging over eastern CONUS. Temperatures will remain seasonable for late June/early July, with highs in the upper 90s to low 100s (80s along the coast) and lows in the 70s. Heat indices from 100-110 degF each afternoon will maintain a moderate risk of heat related illness. Breezy south-southeasterly winds continue each afternoon through the rest of the week, with winds to 20 mph gusting to 25 mph.

Rain chances remain minimal through midweek, with dry air aloft and subsidence suppressing convective development. By Wednesday, the ridge slowly transiting east will increase support for sea breeze showers along the coast daily Wednesday through Friday (low chances, around 20%).

AVIATION

(12Z TAFS) Issued at 621 AM CDT Tue Jun 30 2026

VFR conditions are forecast to continue through the period. Winds are forecast to remain southeasterly, with wind speeds and gusts increasing this afternoon.

MARINE

Issued at 1045 PM CDT Mon Jun 29 2026

Moderate southeasterly flow with briefly higher gusts will gradually diminish to moderate to gentle by Wednesday. Moderate seas decrease to slight. Favorable marine conditions are expected in the latter half of the period, with low (15% or less) rain chances persisting.

PRELIMINARY POINT TEMPS/POPS

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

BRO WATCHES/WARNINGS/ADVISORIES

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