National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

San Antonio, San Antonio International Airport (KSAT)

Lat: 29.53°NLon: 98.46°WElev: 807ft.

Mostly Cloudy

83°F

28°C

Humidity 65%
Wind Speed S 9 mph
Barometer 30.03 in (1014.8 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 26 Aug 12:51 am CDT
Extended Forecast for

Castle Hills TX

Heat Advisory August 26, 01:49am until August 26, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 26, 01:49am until August 26, 07:00pm

    NOW until 7:00pm Wed

    Heat Advisory

  • Overnight

    Low: 78 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny and hot, with a high near 102. Heat index values as high as 105. South southwest wind around 5 mph becoming southeast in the afternoon.

    High: 102 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 78. South southwest wind around 5 mph.

    Low: 78 °F

    Mostly Clear

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 100. Heat index values as high as 105. Calm wind becoming east around 5 mph in the afternoon.

    High: 100 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 78. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 78 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 99. Calm wind becoming east around 5 mph in the afternoon.

    High: 99 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Mostly clear, with a low around 78. East southeast wind around 5 mph.

    Low: 78 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 98. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 98 °F

    Sunny

Detailed Forecast

Overnight
Partly cloudy, with a low around 78. South southwest wind 5 to 10 mph.
Wednesday
Sunny and hot, with a high near 102. Heat index values as high as 105. South southwest wind around 5 mph becoming southeast in the afternoon.
Wednesday Night
Mostly clear, with a low around 78. South southwest wind around 5 mph.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 100. Heat index values as high as 105. Calm wind becoming east around 5 mph in the afternoon.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 78. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 99. Calm wind becoming east around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 78. East southeast wind around 5 mph.
Saturday
Sunny, with a high near 98. Calm wind becoming east southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 77. South southeast wind 5 to 10 mph.
Sunday
Sunny, with a high near 98.
Sunday Night
Clear, with a low around 76.
Monday
Mostly sunny, with a high near 98.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Mostly sunny, with a high near 98.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castle Hills TX
 29.53°N 98.53°W (Elev. 846 ft)
Last Update:
1:40 am CDT Aug 26, 2026
Forecast Valid:
1am CDT Aug 26, 2026-6pm CDT Sep 1, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation