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

90°F

32°C

Humidity 45%
Wind Speed SE 16 G 23 mph
Barometer 29.82 in (1007.8 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 21 Sep 7:51 pm CDT
Extended Forecast for

Castle Hills TX

  • Tonight

    Tonight: Partly cloudy, with a low around 74. South southeast wind 5 to 10 mph.

    Low: 74 °F

    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 96. Heat index values as high as 102. South wind 5 to 10 mph.

    High: 96 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly clear, with a low around 76. Southeast wind 5 to 10 mph.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 99. Heat index values as high as 106. South wind 5 to 10 mph.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am. Mostly clear, with a low around 77. South southeast wind 5 to 10 mph.

    Low: 77 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly sunny, with a high near 94. South wind around 5 mph becoming north northeast in the afternoon. Chance of precipitation is 60%.

    High: 94 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. Northeast wind around 5 mph.

    Low: 72 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 89. North northeast wind around 5 mph.

    High: 89 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 68. East northeast wind around 5 mph becoming calm in the evening.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 74. South southeast wind 5 to 10 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 96. Heat index values as high as 102. South wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 76. Southeast wind 5 to 10 mph.
Tuesday
Mostly sunny and hot, with a high near 99. Heat index values as high as 106. South wind 5 to 10 mph.
Tuesday Night
A 20 percent chance of showers after 1am. Mostly clear, with a low around 77. South southeast wind 5 to 10 mph.
Wednesday
Showers likely and possibly a thunderstorm. Mostly sunny, with a high near 94. South wind around 5 mph becoming north northeast in the afternoon. Chance of precipitation is 60%.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. Northeast wind around 5 mph.
Thursday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 89. North northeast wind around 5 mph.
Thursday Night
Mostly clear, with a low around 68. East northeast wind around 5 mph becoming calm in the evening.
Friday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 91.
Friday Night
A 20 percent chance of showers. Partly cloudy, with a low around 68.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 92.
Saturday Night
A 20 percent chance of showers. Partly cloudy, with a low around 68.
Sunday
A 20 percent chance of showers. Mostly sunny, with a high near 90.
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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:
6:44 pm CDT Sep 21, 2025
Forecast Valid:
8pm CDT Sep 21, 2025-6pm CDT Sep 28, 2025
 
Forecast Discussion
 
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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