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Official National Weather Service forecast information
for Harper, Texas, together with the Austin/San Antonio
forecast discussion and national outlook charts from the
NOAA Weather Prediction Center.
Mostly cloudy, with a high near 75. Southeast wind around 15 mph, with gusts as high as 25 mph.
Tonight
Mostly Cloudy
57°F
SE 5 to 10 mph
Mostly cloudy, with a low around 57. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Partly Sunny
76°F
SSE 5 to 10 mph
Partly sunny, with a high near 76. South southeast wind 5 to 10 mph.
Monday Night
Mostly Cloudy
60°F
SE 5 to 10 mph
Precipitation:
10%
Mostly cloudy, with a low around 60. Southeast wind 5 to 10 mph.
Tuesday
Chance Rain Showers
75°F
SSE 10 mph
Precipitation:
40%
A chance of rain showers after 7am. Mostly cloudy, with a high near 75. South southeast wind around 10 mph. Chance of precipitation is 40%.
Tuesday Night
Chance Rain Showers then Partly Cloudy
59°F
SSE 5 to 10 mph
Precipitation:
40%
A chance of rain showers before 7pm. Partly cloudy, with a low around 59. South southeast wind 5 to 10 mph. Chance of precipitation is 40%.
Wednesday
Partly Sunny
77°F
SSE 10 mph
Partly sunny, with a high near 77. South southeast wind around 10 mph.
Wednesday Night
Partly Cloudy
61°F
SSE 5 to 10 mph
Precipitation:
10%
Partly cloudy, with a low around 61. South southeast wind 5 to 10 mph.
Thursday
Partly Sunny then Chance Showers And Thunderstorms
74°F
SSE 10 mph
Precipitation:
40%
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 74. South southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Thursday Night
Chance Showers And Thunderstorms
59°F
SE 10 mph
Precipitation:
50%
A chance of showers and thunderstorms. Mostly cloudy, with a low around 59. Chance of precipitation is 50%.
Friday
Chance Showers And Thunderstorms
72°F
SSE 10 to 15 mph
Precipitation:
50%
A chance of showers and thunderstorms. Mostly cloudy, with a high near 72. Chance of precipitation is 50%.
Friday Night
Slight Chance Showers And Thunderstorms
59°F
SSE 10 mph
Precipitation:
30%
A chance of rain showers before 7pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a low around 59. Chance of precipitation is 30%.
Saturday
Slight Chance Showers And Thunderstorms then Mostly Cloudy
77°F
S 10 to 15 mph
Precipitation:
20%
A slight chance of showers and thunderstorms before 7am. Mostly cloudy, with a high near 77. Chance of precipitation is 20%.
Saturday Night
Partly Cloudy
62°F
S 5 to 10 mph
Partly cloudy, with a low around 62.
Area Forecast Discussion
National Weather Service Austin/San Antonio · EWX
Latest Area Forecast Discussion
000
FXUS64 KEWX 251050
AFDEWX
Area Forecast Discussion
National Weather Service Austin/San Antonio TX
550 AM CDT Sun Oct 25 2026
...New AVIATION...
.KEY MESSAGES...
Updated at 542 AM CDT Sun Oct 25 2026
- Mild to warm conditions continue through the week.
- Periodic rain chances return early in the week with highest
(30-75%) chances Thursday and Friday.
&&
.SHORT TERM...
(Today through Monday)
Issued at 1215 AM CDT Sun Oct 25 2026
A sharp trough/ridge couplet sits over TX with a SSW/NNE oriented
ridge controlling the weather over eastern and southern portions and
the destabilizing upper trough bringing monsoonal convection to the
western and northern portions of the state. These systems are
expected to eventually shift slowly east, but almost no progress will
be noticeable in the short term over our forecast area. One change
that will be noticeable will come from a plume of high cloudiness
connected to Hurricane Vance which has been taking on increased
shear in the eastern Pacific. At this time, we do not see any
benefit to the Pwat values from the Gulf or Vance as a drying low
level wind flow over the northern Gulf continues to feed dry low
level into Central TX while the small amount of moisture pooling
coming from Deep South TX is funneled NW up the Rio Grande Valley
and into West TX. Through Monday, only an isolated stray shower or
two out over our western counties is foreseeable. Temperatures will
trend slightly cooler today over Saturday, and the Monday morning
low could also trend cooler with that dry easterly low level wind
flow lowering our dew points. Models continue to suggest a mostly
cloudy pattern into Monday, so look for somewhat pleasant daytime
temperatures maxing out in the mid 70s to mid 80s each day.
&&
.LONG TERM...
(Monday night through Saturday)
Issued at 1215 AM CDT Sun Oct 25 2026
The upper low embedded in the broader western CONUS upper trough
will begin to eject NE toward the central plains states Monday while
dragging across NW TX only a small piece of shortwave energy. Monday
night into Tuesday. Height fields over the eastern Pacific will
remain deflated with a weaker but still unstable SW flow pattern
aloft left over W TX Tuesday. A pooling of Gulf moisture begins to
move onshore by this time as low level winds become less easterly,
but the amount of inland progress models show the moisture flux
making looks to be little too late to connect up with the passing
shortwave to the NW. What that has left us is a fairly dry/more
stable pattern over the Hill Country & Central TX with a more moist
and/or unstable set up for Coastal Prairies and part of the Rio
Grande Plains for Tuesday. The Edwards Plateau will see its better
rain chances early Tuesday from the shortwave, but will probably go
stable in the afternoon before the deeper moisture can arrive. All
that said there could be a good chance (40-60%) for some rain over
the Coastal Prairies/Rio Grande Plains areas situated south of San
Antonio metro.
While much attention was spent discussing somewhat uninspiring rain
chances for Tuesday, the best chances for rain in the next 7 days
are forecast for Thursday and Friday after a fairly low coverage
afternoon Wednesday. Wednesday into Wednesday night the tilted ridge
over TX continues to flatten eastward leaving a deep 700 mb to
tropopause pattern of SW flow to connect the rest of TX with some of
that tropical moisture from the eastern Pacific. There will be
considerable uncertainty with what happens with Vance but the
general expectation is for slow movement and a gradual weakening by
early next week. Most of the latest runs, including the AI runs,
hold the system together and well off the coast of Mexico to be
capable of feeding TX a portion of its energy/moisture as it
encounters that SW shear aloft. While our pattern shows no
indications of a surface feature to greatly enhance rain chances,
the rise in PWat values to potentially over 1.8 inches over South TX
could lead to a variety of rain chances, some connected with
instability passing through in the NW flow aloft and others moving
inland as feeder showers and storms. Our current forecast highlights
western counties with the best chances at 50-75%, mainly 25-50% over
the I-35 corridor and Coastal Prairies for both of these days.
Confidence of this pattern holding together lowers significantly
after Friday.
Temperatures remain warm and steady through next week with daytime
highs mostly ranging from the mid 70s to the mid 80s. Pending how
thick cloud cover and how much rain coverage becomes, a day or two
may trend a little lower. Overnights remain mild and a bit humid
with lows ranging mostly from the upper 50s to the mid 60s.
&&
.AVIATION...
(12Z TAFS)
Issued at 542 AM CDT Sun Oct 25 2026
VFR conditions are forecast to persist for the I-35 corridor at
least through the overnight hours. For KDRT, MVFR cigs stay for a
couple of hours and then back to VFR mid morning. MVFR cigs are
forecast to return to KDRT overnight into Monday morning around
11Z. An east to southeast wind flow of around 10 knots to prevail
across the local terminals through the period. Gusts to be
strongest along the Rio Grande which includes KDRT.
&&
.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry 83 58 83 63 / 0 0 0 0
Austin Bergstrom Intl Airport 84 56 84 62 / 0 0 0 0
New Braunfels Muni Airport 83 57 83 63 / 0 0 0 10
Burnet Muni Airport 79 56 79 62 / 0 0 0 10
Del Rio Intl Airport 81 65 81 65 / 10 10 0 10
Georgetown Muni Airport 82 55 82 62 / 0 0 0 0
Hondo Muni Airport 82 59 83 63 / 0 0 0 10
San Marcos Muni Airport 84 55 84 62 / 0 0 0 10
La Grange - Fayette Regional 84 57 85 63 / 0 0 0 0
San Antonio Intl Airport 82 59 82 64 / 0 0 0 20
Stinson Muni Airport 83 61 83 66 / 0 0 0 30
&&
.EWX WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
SHORT TERM...18
LONG TERM....18
AVIATION...17
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