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.

Mostly Cloudy

85°F

29°C

Humidity 63%
Wind Speed W 5 mph
Barometer 30.00 in (1013.9 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 20 Sep 10:51 am CDT
Extended Forecast for

Castle Hills TX

  • Today

    Today: Mostly sunny, with a high near 97. Heat index values as high as 104. Southeast wind around 5 mph.

    High: 97 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 76. Southeast wind around 5 mph.

    Low: 76 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 98. Heat index values as high as 105. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 98 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 76. East southeast wind around 5 mph becoming calm after midnight.

    Low: 76 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 97. Light east northeast wind becoming east 5 to 10 mph in the afternoon.

    High: 97 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 76. East southeast wind 5 to 10 mph becoming light southeast after midnight. Chance of precipitation is 20%.

    Low: 76 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 97. North northeast wind 5 to 10 mph becoming east in the afternoon.

    High: 97 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 76. East wind 5 to 10 mph becoming light east southeast after midnight.

    Low: 76 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 96. East wind 5 to 10 mph.

    High: 96 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 97. Heat index values as high as 104. Southeast wind around 5 mph.
Tonight
Partly cloudy, with a low around 76. Southeast wind around 5 mph.
Monday
Mostly sunny, with a high near 98. Heat index values as high as 105. Calm wind becoming east southeast around 5 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 76. East southeast wind around 5 mph becoming calm after midnight.
Tuesday
Sunny, with a high near 97. Light east northeast wind becoming east 5 to 10 mph in the afternoon.
Tuesday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 76. East southeast wind 5 to 10 mph becoming light southeast after midnight. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 97. North northeast wind 5 to 10 mph becoming east in the afternoon.
Wednesday Night
Partly cloudy, with a low around 76. East wind 5 to 10 mph becoming light east southeast after midnight.
Thursday
Mostly sunny, with a high near 96. East wind 5 to 10 mph.
Thursday Night
Partly cloudy, with a low around 74.
Friday
Mostly sunny, with a high near 95.
Friday Night
Partly cloudy, with a low around 73.
Saturday
Mostly sunny, with a high near 94.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Castle Hills TX
 29.53°N 98.53°W (Elev. 846 ft)
Last Update:
6:46 am CDT Sep 20, 2026
Forecast Valid:
11am CDT Sep 20, 2026-6pm CDT Sep 26, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation