San Antonio, Texas 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

563
FXUS64 KEWX 152305
AFDEWX

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
605 PM CDT Sun Mar 15 2026

...New AVIATION...

.KEY MESSAGES...

- A powerful cold front arriving this afternoon/evening will
  bring strong winds, critical fire weather conditions, and much
  colder temperatures across South-Central Texas.

- Critical fire weather conditions linger into Monday as winds
  gradually weaken during the day.

- Light freezes are possible over the Hill Country Monday morning
  and over the Hill Country and adjacent low lying areas near the
  Balcones Escarpment Tuesday morning.

- A rain free forecast remains through next week with a warming
  trend from midweek through the weekend.

&&

.SHORT TERM...
(Tonight through Monday night)
Issued at 1245 PM CDT Sun Mar 15 2026

The strong cold front arriving later this afternoon is on its way,
with the leading edge along the I-20 corridor as of noon. Before its
arrival here, the combined warming effects of compressional heating
and downsloping flows will impinge on the Balcones Escarpment, and
we continue to project daily record warmth this afternoon along the
I-35 corridor with highs in the mid 90s. To the west, relative
humidity values below 20% are beginning to spread into the Hill
Country behind an advancing dry line, delineating the spread of
critical fire weather conditions. A Red Flag Warning is now in
effect. The dry line should continue east of I-35 by the mid-
afternoon.

By around 3-4 PM, the cold front should reach our northernmost
counties in the Hill Country, racing south across the area and
sweeping across our southernmost counties in the Rio Grande and
Coastal Plains by about 8-9 PM. Strong north winds will develop
quickly behind the front. Widespread sustained winds of 20-30 mph
with gusts of 40-50 mph are expected across South-Central Texas.
Most of the hi-res models also suggest enhancement of winds at
higher terrain after sunset, especially after 9 PM along the
southern rim of the Edwards Plateau. Sustained winds could reach
35 mph with gusts to 55 mph along these ridgetops. A Wind Advisory
will go into effect from 3 PM today to 5 AM Monday when the
strongest winds are anticipated. Secure loose outdoor objects
before the front arrives. Those operating high-profile vehicles
especially along west- east roadways like I-10 and US-90 should
use extra caution this evening and tonight. The front is expected
to remain dry across our region, but a narrow, fast-moving band of
showers with perhaps a rumble of thunder or two may develop along
the leading edge of the front on the eastern fringes of our
region.

The air will rapidly cool behind the front as winds quickly whip in
a much colder airmass, with temperatures dropping into the 30s and
low 40s by sunrise Monday. This represents an impressive 50-55
degree drop in temperatures over a roughly 15-hour window. A light
patchy freeze is possible in the Hill Country. While winds are
expected to be weaker during the coldest period, they will still be
quite breezy and drive wind chills into the 20s and low 30s
especially over the Edwards Plateau and Hill Country.

Monday will stay unseasonably cool during the afternoon, with mid-
to upper-level clouds also suppressing warming some. Highs are
expected to rise only into the 50s and low to mid 60s. Lingering
breezy north winds along with dry air, especially along the I-35
corridor and Coastal Plains, will result in a continued threat for
critical fire weather conditions. Winds across South-Central Texas
should settle to a light to near calm flow as surface high pressure
settles over the region. This will support more favorable conditions
for radiational cooling. Monday night into Tuesday morning is
forecast to feature the coldest temperatures of this cold spell with
lows in the 30s for most of South-Central Texas. Light freezes will
be possible in rural low-lying locations across the Coastal Plains,
I-35 corridor, and Hill Country. For these areas, the likelihood of
a freeze is moderate (40-60%) based on the latest model blend.

&&

.LONG TERM...
(Tuesday through next Sunday)
Issued at 1245 PM CDT Sun Mar 15 2026

A steady warming trend is forecast beginning Tuesday and should
continue on to next weekend. As the parent trough associated with
the cool early-week air moves east, an upper-level ridge is forecast
to intensify over Desert Southwest and inch into our area over the
course of the week. Southerly winds return to South-Central Texas on
Tuesday, raising daytime temperatures back to near-average levels.
By Friday and Saturday, daytime highs could again approach daily
record highs with temperatures in the 90s. This ridging aloft will
keep rain chances out of the picture throughout the week into the
weekend with abundant clear skies.

&&

.AVIATION...
(00Z TAFS)
Issued at 557 PM CDT Sun Mar 15 2026

VFR flight conditions continue but winds will be impactful into
and through the overnight. North winds will sustain in the 20 to
30 kt range with gusts as high as 40 kt. These winds may bring
haze with slight visibilities reductions at KAUS and KSAT during
this evening. Wind speeds subside into and through Monday, but
remain breezy for especially the first half of the day. However,
winds will become light on Monday night. A few high clouds are
possible tonight before high clouds thicken Monday afternoon
into Monday evening. Clouds will then decrease beyond the
evening hours.

&&

.FIRE WEATHER...
Issued at 1245 PM CDT Sun Mar 15 2026

A Red Flag Warning is in effect for all of South-Central Texas. A
dry line is advancing to the I-35 corridor this afternoon. A
combination of 10-20 percent relative humidity, 10-20 mph westerly
winds, and unusually warm temperatures in the 90s in the wake of the
dry line will support the initial period of critical fire weather,
especially over the Hill Country and southern Edwards Plateau. The
dry line then becomes overtaken by a powerful cold front mid-
afternoon to around sunset across the region. Very strong north
winds will arrive immediately and in the wake of this front with
sustained wind speeds climbing into the 20 to 35 mph range and
gusts as high as 45 to 55 mph. Expect for these strong winds to
persist through much of the overnight. Low RH values will spread
across the remainder of the region. Despite rapidly falling
temperatures behind the front, moisture recovery will be poor with
the highest humidity only in the 30 to 35 percent range tonight.

Expect minimum humidity to fall back into the 10 to 20 percent range
Monday afternoon. Winds will remain breezy through Monday afternoon,
especially across the Coastal Plains, but not nearly as strong as
the speeds overnight. The primary areas of concern for critical fire
weather Monday afternoon includes are mainly along and east of I-35
into the Coastal Plains, though daytime temperatures will be much
lower and in the 50s. Wind speeds weaken to light levels across all
areas into Monday night. Dry conditions persist through midweek with
enough wind at times for pockets of some elevated fire weather
conditions across portions of the region. Overnight moisture
recovery improves later in the week with the return and increase of
southerly flow, but a warming trend and dry air will continue to
support daytime RH values below 35 percent.

&&

.CLIMATE...
Issued at 1235 AM CDT Sat Mar 14 2026

Record High Temperatures

                   Mar 15(Sun)
Austin Bergstrom   87 (1977)
Austin Camp Mabry  92 (2016)
San Antonio Intl   91 (1908)
Del Rio            98 (1908)

Record Low Temperatures

                   Mar 16(Mon)      March 17(Tue)
Austin Bergstrom   32 (1962,1947)   30 (2005)
Austin Camp Mabry  30 (1924)        30 (1913)
San Antonio Intl   27 (1947)        32 (1947)
Del Rio            28 (1913)        33 (1969)

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              40  56  36  67 /   0   0   0   0
Austin Bergstrom Intl Airport  41  56  34  67 /   0   0   0   0
New Braunfels Muni Airport     40  58  34  67 /   0   0   0   0
Burnet Muni Airport            37  53  34  66 /   0   0   0   0
Del Rio Intl Airport           45  62  41  71 /   0   0   0   0
Georgetown Muni Airport        39  55  34  66 /   0   0   0   0
Hondo Muni Airport             41  60  34  68 /   0   0   0   0
San Marcos Muni Airport        41  58  34  67 /   0   0   0   0
La Grange - Fayette Regional   41  56  34  67 /  10   0   0   0
San Antonio Intl Airport       42  59  37  67 /   0   0   0   0
Stinson Muni Airport           44  60  37  69 /   0   0   0   0

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning until 8 PM CDT Monday for TXZ171>173-183>194-
202>209-217>225-228.

Wind Advisory until 5 AM CDT Monday for TXZ171>173-183>194-
202>209-217>225-228.

&&

$$

SHORT TERM...Tran
LONG TERM....Tran
AVIATION...62