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.

Fair

85°F

29°C

Humidity 55%
Wind Speed S 10 mph
Barometer 29.98 in (1013.2 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 27 Aug 12:51 am CDT
Extended Forecast for

Castle Hills TX

Heat Advisory August 27, 01:52am until August 27, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 27, 01:52am until August 27, 07:00pm

    NOW until 7:00pm Thu

    Heat Advisory

  • Overnight

    Low: 78 °F

    Mostly Clear

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly after 4pm. Sunny and hot, with a high near 101. Heat index values as high as 106. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 101 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 78. South wind around 5 mph becoming north northwest after midnight.

    Low: 78 °F

    Chance
    T-storms

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 104. 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 77. South southeast wind 5 to 10 mph.

    Low: 77 °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

  • Saturday Night

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

    Low: 77 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 99. South southeast wind 5 to 10 mph.

    High: 99 °F

    Hot

Detailed Forecast

Overnight
Mostly clear, with a low around 78. South southwest wind around 5 mph.
Thursday
A 40 percent chance of showers and thunderstorms, mainly after 4pm. Sunny and hot, with a high near 101. Heat index values as high as 106. Calm wind becoming southeast around 5 mph in the afternoon.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 78. South wind around 5 mph becoming north northwest after midnight.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 104. Calm wind becoming east around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 77. South southeast wind 5 to 10 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 and hot, with a high near 99. South southeast wind 5 to 10 mph.
Sunday Night
Mostly clear, with a low around 76. Southeast wind around 10 mph, with gusts as high as 20 mph.
Monday
Mostly sunny and hot, with a high near 99.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Mostly sunny and hot, with a high near 99.
Tuesday Night
Mostly clear, with a low around 76.
Wednesday
Mostly sunny, with a high near 98.
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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:
1:32 am CDT Aug 27, 2026
Forecast Valid:
1am CDT Aug 27, 2026-6pm CDT Sep 2, 2026
 
Forecast Discussion
 
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Additional Resources

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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