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

81°F

27°C

Humidity 79%
Wind Speed SE 9 mph
Barometer 29.99 in (1013.1 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 13 Sep 2:51 am CDT
Extended Forecast for

San Antonio TX

Heat Advisory September 13, 12:00pm until September 13, 07:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Partly cloudy, with a low around 79. South southeast wind around 5 mph.

    Low: 79 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, then gradually becoming sunny and hot, with a high near 99. Heat index values as high as 107. South southeast wind 5 to 10 mph.

    High: 99 °F

    Hot

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 79. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 79 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny and hot, with a high near 100. Heat index values as high as 107. South southeast wind 5 to 10 mph.

    High: 100 °F

    Hot

  • Monday Night

    Monday Night: Partly cloudy, with a low around 78. Southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 78 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny and hot, with a high near 100. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 100 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 77. Southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 77 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 98. East southeast wind 5 to 10 mph.

    High: 98 °F

    Mostly Sunny

  • Wednesday Night

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

    Low: 77 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 79. South southeast wind around 5 mph.
Sunday
Mostly cloudy, then gradually becoming sunny and hot, with a high near 99. Heat index values as high as 107. South southeast wind 5 to 10 mph.
Sunday Night
Partly cloudy, with a low around 79. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Monday
Mostly sunny and hot, with a high near 100. Heat index values as high as 107. South southeast wind 5 to 10 mph.
Monday Night
Partly cloudy, with a low around 78. Southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
Sunny and hot, with a high near 100. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 77. Southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Wednesday
Mostly sunny, with a high near 98. East southeast wind 5 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 77. Southeast wind 5 to 10 mph.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 96.
Thursday Night
Partly cloudy, with a low around 76.
Friday
Mostly sunny, with a high near 96.
Friday Night
Mostly clear, with a low around 75.
Saturday
Sunny, with a high near 96.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Antonio TX
 29.46°N 98.5°W (Elev. 741 ft)
Last Update:
2:46 am CDT Sep 13, 2026
Forecast Valid:
3am CDT Sep 13, 2026-6pm CDT Sep 19, 2026
 
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Additional Resources

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Chance of Precipitation