textproduct: Brownsville/Rio Grande Valley
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
Updated at 522 PM CST Sat Dec 20 2025 - Unseasonably warm temperatures and dry weather is expected this weekend through next week.
- Patchy fog is expected to develop overnight for the next few days, reducing visibilities on roads and at airports.
DISCUSSION
Issued at 1114 AM CST Sat Dec 20 2025
A upper-level ridge of high pressure is expected to set up over northwest Mexico and move over the southern United States early this week, which will bring significantly warmer-than-average temperatures to much of the CONUS through the holidays. Deep South Texas is no exception, where unseasonably warm, dry weather is expected through at least the end of the week. High temperatures should be in the 80s throughout the week, with low temperatures getting down into the mid-60s. Winds are expected to be southeasterly and light to moderate, and skies should remain clear to partly cloudy. Because of the light winds and the radiational cooling at night due to a lack of cloud cover, patchy fog is expected to develop throughout the region in the early morning hours for the next few days.
AVIATION
(00Z TAFS) Issued at 522 PM CST Sat Dec 20 2025
Overnight, southerly winds are expected to become light along with broken MVFR ceilings developing closer to sunrise, possibly IFR at KHRL and BRO. There is a low possibility of fog overnight tonight, but opted to not include in the TAFs as confidence is also low at this time. Ceilings lift to MVFR throughout Sunday morning, becoming scattered and VFR by the afternoon along with southeasterly winds of around 5-10 knots, gusting possibly to 15-20 knots.
MARINE
Issued at 1114 AM CST Sat Dec 20 2025
Marine conditions should be favorable throughout the week. Light to moderate southeasterly winds are expected along with low to moderate seas.
PRELIMINARY POINT TEMPS/POPS
BROWNSVILLE 69 85 69 83 / 0 0 10 20 HARLINGEN 65 86 65 83 / 0 0 10 10 MCALLEN 67 87 69 85 / 0 0 10 10 RIO GRANDE CITY 59 86 64 86 / 0 0 0 10 SOUTH PADRE ISLAND 69 77 70 76 / 0 0 10 20 BAYVIEW/PORT ISABEL 67 82 67 81 / 0 0 10 20
BRO WATCHES/WARNINGS/ADVISORIES
TX...None. GM...None.
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