textproduct: Brownsville/Rio Grande Valley

KEY MESSAGES

Updated at 1020 PM CST Sun Dec 7 2025

* Behind a cold front passing this evening, expect for hazardous coastal and marine conditions to develop through Monday.

* Dry weather with fluctuating temperatures are expected to persist through the upcoming workweek.

* Adverse to hazardous marine conditions could develop once again Friday through next weekend following the passage of a second cold front.

DISCUSSION

Issued at 1020 PM CST Sun Dec 7 2025

A couple of cool/cold fronts will sweep through Deep South Texas and the Rio Grande Valley through next weekend. This will drive a mostly rain-free (dry) weather pattern with fluctuating temperatures through next weekend. The only weather hazards will be focused over the Laguna Madre and Gulf Waters during this period (see MARINE SECTION for more details).

We start off the forecast period tonight where the first cool/cold front is pushing through the Rio Grande Valley. Dry and cold air advection (CAA) will increase tonight into Monday amid northerly winds behind the cold fropa. A noticeably cooler and drier night compared to last night awaits. Overnight low temperatures will fall to cooler than normal levels for this time of year with values in the 40s most places (lower 50s along the Mid and Lower RGV).

Monday will feature markedly cooler temperatures compared to today where high temperatures on Monday are progged to be on the order of 20F degrees cooler than Sunday. Highs most places will struggle to make it out of the 60s, also cooler than normal for this time of year. Monday night will be another cold night with overnight lows mainly in the 40s across Deep South Texas.

Temperatures begin to moderate on Tuesday with a return flow developing out of the south. Highs on Tuesday will be in the 70s and in the 80s Wednesday through Friday.

Another cool frontal boundary approaches the region next weekend, which will lower temperatures once again. Currently, we have high temps topping out in the 70s Saturday through Monday. Overnight low temperatures Tuesday night will be in the 50s most places (40s across the Northern Ranchlands). Wednesday night through next Sunday night will mainly be in the 50s and 60s.

AVIATION

(06Z TAFS) Issued at 1020 PM CST Sun Dec 7 2025

Through 06z Tuesday...VFR conditions are expected to persist through the entire 06z TAF cycle.

Following the cool fropa, winds will continue out of the north with speeds between 5-15 kts. There could be some gusts up to 25 kts from time to time through Monday afternoon, weakening in time. By Monday evening/night, winds will become light and variable to calm.

MARINE

Issued at 1020 PM CST Sun Dec 7 2025

Conditions have begun to deteriorate and will continue through tonight in response to a cool/cold fropa. Strong northerly winds gusting to near gale and seas building to rough are expected through Monday morning. A Small Craft Advisory remains in place through 6PM CST Monday. Monday night, favorable conditions return and will persist through the week with low to moderate winds and seas. Beginning on Friday, conditions will potentially deteriorate once again in response to another cold front that will bring elevated wind and seas through next weekend.

PRELIMINARY POINT TEMPS/POPS

BROWNSVILLE 85 53 67 50 / 0 0 0 0 HARLINGEN 86 48 67 45 / 0 0 0 0 MCALLEN 88 51 70 48 / 0 0 0 0 RIO GRANDE CITY 86 48 70 42 / 0 0 0 0 SOUTH PADRE ISLAND 77 60 65 60 / 0 0 0 0 BAYVIEW/PORT ISABEL 83 53 66 51 / 0 0 0 0

BRO WATCHES/WARNINGS/ADVISORIES

TX...High Rip Current Risk through Monday afternoon for TXZ451-454- 455.

GM...Small Craft Advisory until 6 PM CST Monday for GMZ130-132-135- 150-155-170-175.