textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 618 AM CDT Sun Oct 18 2026

- Another cool night is expected with light winds and clear skies; Sunday will feature another cool day with highs mainly in the 70s.

- A warming trend begins next week with highs generally in the mid- upper 80s to lower 90s (warmest west).

- There will be day-to-day or near day-to-day low-medium (20-50%) rain chances Sunday through Wednesday; best chances will be near/along the coast and over the Gulf Waters.

DISCUSSION

Issued at 1053 PM CDT Sat Oct 17 2026

Our first taste of Autumn continues this weekend Across Deep South Texas and the Rio Grande Valley, with temperatures ranging 10-20F degrees below average for mid-October standards. Northerly winds have eased from this afternoon. Sufficient radiational cooling through the combination of light winds and clear skies will result in overnight lows falling into the 50s tonight. Continued cool air advection (CAA) on Sunday will help to hold high temperatures in the 70s most places.

A warming trend will commence on Monday and continue through the upcoming workweek as a 588-591 dam heat ridge strengthens over the region. High temperatures generally will range between the mid-upper 80s to low 90s (warmest west) each day for the upcoming workweek.

There will day-to-day or near day-to-day low-medium (20-50%) chances for rain showers Sunday through Wednesday, courtesy of a nearby weak shortwave trough. The best chances will be near/along the coast (i.e. along/east of IH-69E) and over the Gulf Waters.

AVIATION

(12Z TAFS) Issued at 618 AM CDT Sun Oct 18 2026

VFR is anticipated at the aerodromes through the next 24 hours, with generally light winds and partly to mostly cloudy skies.

MARINE

Issued at 1053 PM CDT Sat Oct 17 2026

Adverse marine conditions will continue into the upcoming workweek. Our Small Craft Advisory will expire at 1AM CDT. Small Craft Exercise Caution (SCEC) conditions will continue Sunday through much of the week. Otherwise, day-to-day or near day-to-day rain chances will exist through Wednesday of next week.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 78 67 83 71 / 10 30 30 20 HARLINGEN 79 64 84 68 / 10 20 40 10 MCALLEN 80 65 86 70 / 0 0 10 10 RIO GRANDE CITY 78 63 85 68 / 0 0 0 10 SOUTH PADRE ISLAND 77 72 81 76 / 40 30 50 20 BAYVIEW/PORT ISABEL 77 67 82 72 / 30 30 50 20

BRO WATCHES/WARNINGS/ADVISORIES

TX...Coastal Flood Advisory until 7 AM CDT this morning for TXZ451- 454-455.

High Rip Current Risk until 7 AM CDT this morning for TXZ451-454- 455.

High Surf Advisory until 7 AM CDT this morning for TXZ451-454- 455.

GM...None.