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.

A Few Clouds

81°F

27°C

Humidity 69%
Wind Speed SE 6 mph
Barometer 30.03 in (1014.8 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 22 Aug 2:51 am CDT
Extended Forecast for

Castle Hills TX

Heat Advisory August 22, 03:10am until August 23, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 22, 03:10am until August 23, 07:00pm

    NOW until 7:00pm Sun

    Heat Advisory

  • Overnight

    Low: 78 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 102. Heat index values as high as 106. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 102 °F

    Hot

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 77. Southeast wind around 5 mph becoming southwest after midnight.

    Low: 77 °F

    Increasing
    Clouds

  • Sunday

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

    High: 102 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 77. South southeast wind 5 to 10 mph.

    Low: 77 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 101. South southwest wind around 5 mph.

    High: 101 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 101. South wind around 5 mph.

    High: 101 °F

    Hot

Detailed Forecast

Overnight
Mostly clear, with a low around 78. South wind around 5 mph.
Saturday
Mostly sunny and hot, with a high near 102. Heat index values as high as 106. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Increasing clouds, with a low around 77. Southeast wind around 5 mph becoming southwest after midnight.
Sunday
Sunny and hot, with a high near 102. Heat index values as high as 105. Calm wind becoming southeast around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 77. South southeast wind 5 to 10 mph.
Monday
Sunny and hot, with a high near 101. South southwest wind around 5 mph.
Monday Night
Mostly clear, with a low around 77. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
Sunny and hot, with a high near 101. South wind around 5 mph.
Tuesday Night
Clear, with a low around 78. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Sunny and hot, with a high near 102.
Wednesday Night
Mostly clear, with a low around 78.
Thursday
Sunny and hot, with a high near 102.
Thursday Night
Mostly clear, with a low around 78.
Friday
Sunny and hot, with a high near 101.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castle Hills TX
 29.53°N 98.53°W (Elev. 846 ft)
Last Update:
2:46 am CDT Aug 22, 2026
Forecast Valid:
3am CDT Aug 22, 2026-6pm CDT Aug 28, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

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Chance of Precipitation