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

89°F

32°C

Humidity 55%
Wind Speed SE 18 G 28 mph
Barometer 29.80 in (1007.2 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 18 May 5:51 pm CDT
Extended Forecast for

Castle Hills TX

  • Tonight

    Tonight: Increasing clouds, with a low around 78. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 78 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 90. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 90 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 10pm, then showers likely and possibly a thunderstorm between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 71. Southeast wind 5 to 15 mph becoming northeast after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between 1 and 2 inches possible.

    Low: 71 °F

    Heavy Rain

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 84. East wind 5 to 10 mph. Chance of precipitation is 60%.

    High: 84 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 72. East southeast wind 5 to 10 mph. Chance of precipitation is 80%.

    Low: 72 °F

    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 82. South southeast wind 5 to 10 mph. Chance of precipitation is 90%.

    High: 82 °F

    Showers then
    T-storms

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. South southeast wind around 5 mph. Chance of precipitation is 70%.

    Low: 70 °F

    Showers
    Likely

  • Friday

    Friday: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 84. South wind around 5 mph. Chance of precipitation is 60%.

    High: 84 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 70. Southeast wind around 5 mph becoming south southwest after midnight.

    Low: 70 °F

    Heavy Rain

Detailed Forecast

Tonight
Increasing clouds, with a low around 78. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 90. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
A chance of showers and thunderstorms before 10pm, then showers likely and possibly a thunderstorm between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 71. Southeast wind 5 to 15 mph becoming northeast after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between 1 and 2 inches possible.
Wednesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 84. East wind 5 to 10 mph. Chance of precipitation is 60%.
Wednesday Night
Showers and possibly a thunderstorm. Low around 72. East southeast wind 5 to 10 mph. Chance of precipitation is 80%.
Thursday
Showers and possibly a thunderstorm. High near 82. South southeast wind 5 to 10 mph. Chance of precipitation is 90%.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. South southeast wind around 5 mph. Chance of precipitation is 70%.
Friday
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 84. South wind around 5 mph. Chance of precipitation is 60%.
Friday Night
A 50 percent chance of showers and thunderstorms. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 70. Southeast wind around 5 mph becoming south southwest after midnight.
Saturday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 82. Chance of precipitation is 70%.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.
Sunday
Showers and thunderstorms likely. Mostly cloudy, with a high near 83. Chance of precipitation is 60%.
Sunday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Memorial Day
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
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ABOUT THIS FORECAST

 
Point Forecast:
Castle Hills TX
 29.53°N 98.51°W (Elev. 869 ft)
Last Update:
5:32 pm CDT May 18, 2026
Forecast Valid:
6pm CDT May 18, 2026-6pm CDT May 25, 2026
 
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