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

San Antonio, San Antonio International Airport (KSAT)

Lat: 29.53°NLon: 98.46°WElev: 807ft.

A Few Clouds

93°F

34°C

Humidity 38%
Wind Speed Calm
Barometer 29.98 in (1013.1 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 1 Sep 1:51 pm CDT
Extended Forecast for

Castle Hills TX

  • This Afternoon

    This Afternoon: Sunny, with a high near 98. Heat index values as high as 104. East wind around 5 mph.

    High: 98 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 78. East southeast wind around 5 mph becoming south after midnight.

    Low: 78 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 100. Heat index values as high as 106. Southwest wind around 5 mph.

    High: 100 °F

    Hot

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 78. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 78 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny and hot, with a high near 99. South wind 5 to 10 mph.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 77. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 97. South southeast wind around 5 mph.

    High: 97 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 76. East southeast wind 5 to 10 mph.

    Low: 76 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 97. South southeast wind around 5 mph.

    High: 97 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 98. Heat index values as high as 104. East wind around 5 mph.
Tonight
Mostly clear, with a low around 78. East southeast wind around 5 mph becoming south after midnight.
Wednesday
Sunny and hot, with a high near 100. Heat index values as high as 106. Southwest wind around 5 mph.
Wednesday Night
Partly cloudy, with a low around 78. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny and hot, with a high near 99. South wind 5 to 10 mph.
Thursday Night
Partly cloudy, with a low around 77. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Friday
Mostly sunny, with a high near 97. South southeast wind around 5 mph.
Friday Night
Partly cloudy, with a low around 76. East southeast wind 5 to 10 mph.
Saturday
Mostly sunny, with a high near 97. South southeast wind around 5 mph.
Saturday Night
Mostly clear, with a low around 77.
Sunday
Sunny, with a high near 97.
Sunday Night
Mostly clear, with a low around 76.
Labor Day
Sunny, with a high near 97.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Castle Hills TX
 29.53°N 98.51°W (Elev. 869 ft)
Last Update:
2:46 pm CDT Sep 1, 2026
Forecast Valid:
2pm CDT Sep 1, 2026-6pm CDT Sep 7, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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