Brownsville, Texas 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

305
FXUS64 KBRO 222329 AAA
AFDBRO

Area Forecast Discussion...UPDATED
National Weather Service Brownsville TX
529 PM CST Mon Dec 22 2025

...New AVIATION...

.KEY MESSAGES...
Updated at 524 PM CST Mon Dec 22 2025

 * A Marine Weather Statement is in effect until 21z for lingering
   areas of patchy fog over the bay and nearshore waters.

 * There is a low (20-30%) chance of showers and perhaps a few
   weak thunderstorms this afternoon and tomorrow. Conditions will
   dry out by Wednesday.

 * Unseasonably warm temperatures continue through the weekend with
   highs in the 80s and lows in the 60s.

&&

.DISCUSSION...
Issued at 1120 AM CST Mon Dec 22 2025

Middle and upper-level ridging is in place over the region and is
expected to remain so until at least next weekend, which is
generally supportive of dry and unseasonably warm weather. However,
a weak surface frontal boundary is currently stalled over Deep South
Texas, which is providing an area of low-level lift and instability.
This is supportive of a low (20-30%) chance of showers and perhaps a
few weaker thunderstorms the remainder of this afternoon and
tomorrow. Once this boundary completely lifts out of the area by
Wednesday, conditions should dry out once again through the end of
the week. Winds are expected to be southeasterly and light to
moderate with clear to partly cloudy skies.  The lighter winds at
night and the clearer overnight skies could continue to support some
patchy fog development tonight due to radiational cooling, though it
doesn`t appear to be as robust as it was over this past weekend.

Temperatures are expected to remain around 10 degrees above seasonal
values this week, with highs reaching the mid 80s through the
weekend, and lows getting down into the mid 60s.  Longer-range model
guidance is suggesting that a cold front could make it to Deep South
Texas Sunday night into Monday, which will increase precipitation
chances to around 20-30% and bring temperatures back to seasonal
levels for next week.

&&

.AVIATION...
(00Z TAFS)
Issued at 524 PM CST Mon Dec 22 2025

VFR conditions are expected to give way to MVFR and IFR
conditions this evening into tonight. Fog may not be as much of an
issue as it has been the past couple of nights, but cannot be
ruled out near HRL especially near daybreak. Conditions are
expected to improve mid Tuesday morning back to VFR.

&&

.MARINE...
Issued at 1120 AM CST Mon Dec 22 2025

There is ongoing patchy marine fog, and a Marine Weather Statement
is in effect through 21z for 0-20 nm, due to the potential for areas
of patchy, dense fog over the waters a few more hours this
afternoon. This is expected to lift by later afternoon but there
is the chance that more patchy fog could develop overnight as
warmer air continues to be advected into the region over cooler
sea surface temperatures. There is also a low chance of showers
and thunderstorms (20-30%) the remainder of the afternoon. Other
than fog and shower potential, marine conditions should be overall
favorable throughout the week. Light to moderate southeasterly
winds are expected throughout the week along with low to moderate
seas.

&&

.PRELIMINARY POINT TEMPS/POPS...
BROWNSVILLE             68  83  67  83 /  10  10   0  10
HARLINGEN               65  84  64  83 /  10  20   0   0
MCALLEN                 69  86  67  86 /  10  20   0   0
RIO GRANDE CITY         66  86  65  86 /  10  20   0   0
SOUTH PADRE ISLAND      69  76  70  76 /  10  10   0  10
BAYVIEW/PORT ISABEL     67  80  65  80 /  10  10   0   0

&&

.BRO WATCHES/WARNINGS/ADVISORIES...
TX...None.
GM...None.
&&

$$

SHORT TERM...55-MM
LONG TERM....55-MM
AVIATION...56-Hallman