textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 125 PM CDT Thu Aug 27 2026

- Heat continues, with "feels like" temperatures in the triple digits. There is a Major to Extreme risk of heat-related illness daily through the weekend.

- Low (around 10%) chance of isolated showers/thunderstorms along the sea breeze are possible daily beginning tomorrow into early next week. Rain chances are greatest (30%) Saturday afternoon.

- Ongoing drought conditions and dry grasses could lead to some fire weather concerns.

DISCUSSION

Issued at 125 PM CDT Thu Aug 27 2026

High pressure over central CONUS will maintain hot and mostly dry conditions. Shortwaves on the periphery of this ridging will support low chances (10-30%) of isolated showers and thunderstorms this weekend. These typical summertime pop-ups are possible each afternoon starting Friday into early next week along the sea breeze, with greatest rain chances Saturday afternoon.

Heat will continue to be the main impact, with above-normal high temperatures in the triple digits (upper 80s-90s along the coast) each afternoon. There is a chance that temperatures will tie or break previous daily record highs this afternoon (see CLIMATE section). "Feels like" temperatures will max out today and Friday afternoon from 105-110 with a couple of locations (inland coastal counties) briefly reaching 111 degrees. This will bring a Major (level 3 of 4) risk of heat-related illness, with pockets of Extreme (level 4 of 4) across the RGV and Rio Grande Plains through the weekend. Visit weather.gov/heat for tips on staying safe in the heat.

Minimum relative humidity from 20-45% (lowest west of US-281) this weekend, paired with high temperatures and limited rain coverage will maintain or worsen our ongoing drought. Dry to critically dry fuels are worth keeping an eye on regarding fire weather, but 20-foot winds at 10-15 kts limit the need for fire danger headlines at this time.

AVIATION

(18Z TAFS) Issued at 1218 PM CDT Thu Aug 27 2026

VFR conditions prevail. Southeasterly flow will remain breezy with occasional gusts around 20 knots through the afternoon before diminishing this evening.

MARINE

Issued at 125 PM CDT Thu Aug 27 2026

Favorable marine conditions persist into the weekend with gentle to moderate southerly to onshore flow and slight seas. Isolated showers and thunderstorms are possible over the Gulf Friday into early next week (10-30%), with the greatest chances Saturday. Flow strengthens early next week, and may bring Small Craft Exercise Caution conditions along the Laguna Madre.

CLIMATE

Issued at 125 PM CDT Thu Aug 27 2026

Record daily high temperatures may be tied or broken across the RGV today. The existing record high temperatures for Brownsville, Harlingen, and McAllen are listed below.

Thursday, August 27th

Brownsville: 102F in 2023 Harlingen: 104F in 1948 McAllen: 105F in 2018

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 80 98 80 97 / 0 10 0 20 HARLINGEN 76 101 76 100 / 0 10 0 20 MCALLEN 80 104 80 103 / 0 10 0 10 RIO GRANDE CITY 78 104 78 103 / 0 0 0 0 SOUTH PADRE ISLAND 81 89 81 89 / 0 0 0 10 BAYVIEW/PORT ISABEL 78 96 78 95 / 0 0 0 20

BRO WATCHES/WARNINGS/ADVISORIES

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