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

Hazardous Weather Conditions

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 74%
Wind Speed SE 8 mph
Barometer 29.88 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 11 Sep 11:51 pm CDT
Extended Forecast for

Balcones Heights TX

Heat Advisory September 12, 12:00pm until September 12, 07:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 77. South southeast wind around 10 mph.

    Low: 77 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 102. Heat index values as high as 109. South southeast wind 5 to 10 mph.

    High: 102 °F

    Hot

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 77. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 100. Heat index values as high as 105. South southeast wind 5 to 10 mph.

    High: 100 °F

    Hot

  • Sunday Night

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

    Low: 77 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny and hot, with a high near 99. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 99 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 99. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 76. Southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Overnight
A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 77. South southeast wind around 10 mph.
Saturday
Mostly sunny and hot, with a high near 102. Heat index values as high as 109. South southeast wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 77. South southeast wind around 10 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny and hot, with a high near 100. Heat index values as high as 105. South southeast wind 5 to 10 mph.
Sunday Night
Partly cloudy, with a low around 77. Southeast wind around 10 mph, with gusts as high as 20 mph.
Monday
Mostly sunny and hot, with a high near 99. South wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 77. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny and hot, with a high near 99. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 76. Southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 97.
Wednesday Night
Partly cloudy, with a low around 76.
Thursday
Mostly sunny, with a high near 96.
Thursday Night
Partly cloudy, with a low around 76.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Balcones Heights TX
 29.5°N 98.58°W (Elev. 902 ft)
Last Update:
11:42 pm CDT Sep 11, 2026
Forecast Valid:
12am CDT Sep 12, 2026-6pm CDT Sep 18, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation