textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 125 PM CDT Sun Oct 18 2026

- Another cool night is expected with light winds and clear skies; Monday will feature another below normal day with highs mainly in the low to mid 80s.

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

- 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 125 PM CDT Sun Oct 18 2026

Another pleasant day is expected across Deep South Texas this afternoon with highs in the 70s and light northerly winds. Low level flow is expected to gradually shift from the north/northeast to the southeast by the end of the week, which will allow for a quick warming trend and influx of Gulf moisture across the region. Temperatures should return closer to or slightly above seasonal normals in the mid to upper 80s by Tuesday or Wednesday, but a few areas west of US-281 are expected to warm into the low 90s. While it will be seasonably hot for mid to late October, heat indices are expected to remain in the low to mid 90s.

Near daily low to medium (20-50%) rain chances will exist through mid week due to the combination of increasing moisture content and a nearby disturbance. The best chances will be confined along the immediate coast each day, with the exception being on Wednesday when rain chances increase further inland. Rain-free conditions are expected heading into the end of the week and the weekend.

AVIATION

(18Z TAFS) Issued at 125 PM CDT Sun Oct 18 2026

VFR will prevail through the forecast period. Expect generally light northerly winds around or below 10 knots through late this evening before becoming calm to light around 5 knots or less tonight.

MARINE

Issued at 125 PM CDT Sun Oct 18 2026

Marine conditions continue to improve over the Gulf waters and Laguna Madre today, although brief Small Craft Exercise Caution conditions cannot be ruled out this afternoon due to occasional gusty winds. Light to moderate winds and moderate seas will prevail through the week, with brief Small Craft Exercise Caution conditions possible. Low to medium (20-60%) rain chances will return across the Gulf waters beginning Monday and continuing through at least late Wednesday. Locally enhanced winds and seas are likely within any showers or storms.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 69 83 74 87 / 20 30 20 20 HARLINGEN 66 85 70 88 / 20 20 30 20 MCALLEN 67 86 72 91 / 0 10 20 10 RIO GRANDE CITY 63 85 70 90 / 0 0 10 10 SOUTH PADRE ISLAND 73 81 77 83 / 20 50 20 30 BAYVIEW/PORT ISABEL 69 83 73 84 / 30 40 20 30

BRO WATCHES/WARNINGS/ADVISORIES

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