textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 540 AM CDT Mon Jun 8 2026

- Low to medium rain chances continue into Monday before drier conditions return.

- Temperatures gradually increase through the week with mid to upper 90s across much of the region by Wednesday.

- Moderate Heat Risk is expected through the week.

DISCUSSION

Issued at 1050 PM CDT Sun Jun 7 2026

An upper level jet will support continued rain chances into Monday. Moisture advection under this jet has maintained anomalously high PWAT values (2-2.5") across the region. There is a low (10-30%) chance of showers along the coast prior to sunrise, moving inland through the day. The greatest chance (20-40%) of showers and thunderstorms is this afternoon/evening west of I-69C, with brief, heavy showers possible region-wide.

High pressure building over the Gulf will bring dominant ridging over deep South Texas for much of the week, suppressing deeper moisture advection and rain chances. Relative humidity greater than 40% and high temperatures in the 90s will leave a persistent moderate risk of heat related illness throughout the week. Temperatures will gradually increase over the next couple days, with heat indices in the triple digits - up to 110 in the upper RGV by midweek. Heat advisories are unlikely at this time. Low temperatures flirt near record maximums, persistently in the mid 70s to low 80s.

At local beaches, increased swell and wave heights maintain hazardous swimming conditions with a moderate risk of life threatening rip currents.

AVIATION

(12Z TAFS) Issued at 540 AM CDT Mon Jun 8 2026

MVFR to VFR continue to be expected at the aerodromes through the next 24 hours. A TEMPO remains for BRO and HRL for the possibility of convection that is approaching these aerodromes from the south. Breezy winds today will become lighter tonight.

MARINE

Issued at 1050 PM CDT Sun Jun 7 2026

Scattered to isolated showers and thunderstorms continuing through Monday, along with moderate to fresh southeasterly flow will maintain adverse marine conditions. Conditions improve late Monday. Moderate southeasterly flow, slight to moderate seas, and 6 to 7 second swell will prevail. Rain chances generally less than 10 percent through the rest of the week.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 90 81 92 80 / 10 10 0 0 HARLINGEN 91 78 92 77 / 10 10 0 0 MCALLEN 93 80 95 79 / 30 10 0 0 RIO GRANDE CITY 94 78 96 77 / 30 10 0 0 SOUTH PADRE ISLAND 87 83 87 83 / 10 10 0 0 BAYVIEW/PORT ISABEL 89 81 89 80 / 10 10 0 0

BRO WATCHES/WARNINGS/ADVISORIES

None.