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

82°F

28°C

Humidity 79%
Wind Speed SE 8 mph
Barometer 30.02 in (1014.6 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 31 Aug 8:51 am CDT
Extended Forecast for

Castle Hills TX

  • Today

    Today: Mostly sunny, with a high near 98. Heat index values as high as 105. Southeast wind 5 to 10 mph.

    High: 98 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 77. East southeast wind 5 to 10 mph becoming south after midnight.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99. Heat index values as high as 103. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 77. East southeast wind around 5 mph becoming south after midnight.

    Low: 77 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 99. South wind around 5 mph.

    High: 99 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 77. Southeast wind 5 to 10 mph.

    Low: 77 °F

    Mostly Clear

  • 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: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 98. South southeast wind 5 to 10 mph. Chance of precipitation is 20%.

    High: 98 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

Detailed Forecast

Today
Mostly sunny, with a high near 98. Heat index values as high as 105. Southeast wind 5 to 10 mph.
Tonight
Mostly clear, with a low around 77. East southeast wind 5 to 10 mph becoming south after midnight.
Tuesday
Sunny and hot, with a high near 99. Heat index values as high as 103. Calm wind becoming east southeast around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 77. East southeast wind around 5 mph becoming south after midnight.
Wednesday
Sunny and hot, with a high near 99. South wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 77. Southeast wind 5 to 10 mph.
Thursday
Mostly sunny and hot, with a high near 99. South wind 5 to 10 mph.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 98. South southeast wind 5 to 10 mph. Chance of precipitation is 20%.
Friday Night
A 20 percent chance of showers. Partly cloudy, with a low around 77.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 98.
Saturday Night
Mostly clear, with a low around 77.
Sunday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 98.
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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:
6:42 am CDT Aug 31, 2026
Forecast Valid:
9am CDT Aug 31, 2026-6pm CDT Sep 6, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation