San Antonio, Texas 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

266
FXUS64 KEWX 191100
AFDEWX

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
600 AM CDT Sat Jul 19 2025

...New UPDATE, AVIATION...

.KEY MESSAGES...

- Dry and warm weather continues this weekend into next week.

- Heat index values may reach between 100 to 107 each afternoon for the
  I-35 corridor, Coastal Plains, and Rio Grande Plains.

&&
.UPDATE...
Issued at 600 AM CDT Sat Jul 19 2025

The residual mid level circulation of former tropical disturbance
AL93 drifting to the west over Central Texas has generated a band of
light shower/sprinkles. Chances have increased slightly of very
light measurable rains and have updated to mention in the forecast.
Some models/ensembles generate isolated showers and thunderstorms
near the base of this disturbance this afternoon into early evening
over the I-35 corridor region. Later forecasts may introduce mention
should this trend increase.

&&

.SHORT TERM...
(Today through Sunday)
Issued at 1236 AM CDT Sat Jul 19 2025

The residual mid-level circulation of a tropical disturbance over
East Texas is expected to track west tonight, bringing it north of
the Austin area and potentially into the northern Hill Country as it
slowly decays. There may be some brief light or sprinkly showers in
the Austin area and northern Hill Country near the core of this
remnant vortex late morning to afternoon today, but the broader
ridging across the region and a drier undercutting southwesterly
flow is expected to keep shower coverage and intensity sparser and
lighter. Additional isolated activity could develop over the Coastal
Plains later in the afternoon if sufficient daytime heating occurs,
but confidence in this is very low. For most, the main effect of this
passerby system for Saturday will be the presence of a mid- level
cloud deck during the day mainly north of Interstate 10, with high
clouds elsewhere as northwesterly flow from an upper-trough in the
Gulf shears off cirrus towards the Rio Grande. With similar
conditions to Friday, Saturday`s highs will be similar, with low 90s
to the north for areas with more cloudiness and mid 90s to near 100
elsewhere. With the added moisture, peak afternoon heat indices of
100 to 107 are expected for areas outside of the Hill Country.

The moisture envelope associated with the circulation thins out
Saturday night into Sunday morning. The upper-trough in the Gulf
moves onshore Sunday, delivering a push of mid-level clouds and
cirrus again but without the lower level forcing and moisture to
generate rain. Temperatures and heat indices Sunday are forecast to
be similar to Saturday.

&&

.LONG TERM...
(Sunday night through Friday)
Issued at 1236 AM CDT Sat Jul 19 2025

A steady ridge of high pressure is forecast to remain over our area
throughout next week, keeping the weather warm and dry over South-
Central Texas. The intensity of the ridging over our area remains
similar each day, so temperatures are expected to hold steady during
the week. Highs in the mid to upper 90s are forecast with highs near
or just over 100 along the Rio Grande and in the Rio Grande Plains.
While dry conditions are forecast, persistent southerly to
southeasterly flow will maintain a steady stream of Gulf moisture
into the area, leading to elevated heat indices in the 100 to 107
range each afternoon. This will also maintain overnight lows in the
mid to upper 70s for most.

Farther in the forecast period, there is some potential that a low-
level trough riding along the southern periphery of the ridge along
the northern Gulf coast could bring some chance for rain late next
week. However, that outcome is sensitive to the orientation and
strength of the ridge, so for now rain chances remain low in the
late week.

&&

.AVIATION...
(12Z TAFS)
Issued at 600 AM CDT Sat Jul 19 2025

A band of -SHRA has developed southwest of the tropical disturbance.
There is also a potential for SHRA/TSRA later this afternoon into
evening. However, PROBs are currently too to mention in the TAFs.
Areas of MVFR CIGs mix out by late morning leaving VFR skies
areawide through this evening, then return overnight. S to SE winds
prevail with increased speeds/gustiness late morning through evening
hours.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              97  77  96  76 /  10  10   0   0
Austin Bergstrom Intl Airport  97  77  96  75 /  10  10   0   0
New Braunfels Muni Airport     98  75  97  75 /  10  10   0   0
Burnet Muni Airport            93  75  93  73 /  10  10   0   0
Del Rio Intl Airport           98  78  97  77 /   0   0   0   0
Georgetown Muni Airport        96  76  95  75 /  10  10   0   0
Hondo Muni Airport             96  75  95  75 /  10  10   0   0
San Marcos Muni Airport        97  75  97  75 /  10  10   0   0
La Grange - Fayette Regional   96  77  95  75 /  10  10   0   0
San Antonio Intl Airport       97  77  96  77 /  10  10   0   0
Stinson Muni Airport           99  77  99  77 /  10  10   0   0

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

Short-Term...04
Long-Term...Tran
Aviation...04