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

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Partly Cloudy

98°F

37°C

Humidity 46%
Wind Speed NE 12 G 20 mph
Barometer 29.87 in (1010.5 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index109°F (43°C)
Last update 23 Jul 4:56 pm CDT
Extended Forecast for

3 Miles WSW Kyle TX

Heat Advisory July 23, 05:11pm until July 23, 08:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory July 23, 05:11pm until July 23, 08:00pm

    NOW until 8:00pm Thu

    Heat Advisory

  • Tonight

    Low: 78 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 94. Heat index values as high as 105. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 94 °F

    Decreasing
    Clouds

  • Friday Night

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

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 95. Heat index values as high as 102. South wind around 5 mph.

    High: 95 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 74. South wind 5 to 10 mph.

    Low: 74 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 96. South southwest wind around 5 mph.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75. South wind around 5 mph.

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 97. South southwest wind 5 to 10 mph.

    High: 97 °F

    Sunny

Detailed Forecast

Tonight
A chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Increasing clouds, with a low around 78. Northeast wind 5 to 15 mph becoming south southeast after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 40%.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 94. Heat index values as high as 105. South wind 5 to 15 mph, with gusts as high as 25 mph.
Friday Night
Mostly clear, with a low around 76. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 95. Heat index values as high as 102. South wind around 5 mph.
Saturday Night
Mostly clear, with a low around 74. South wind 5 to 10 mph.
Sunday
Sunny, with a high near 96. South southwest wind around 5 mph.
Sunday Night
Mostly clear, with a low around 75. South wind around 5 mph.
Monday
Sunny, with a high near 97. South southwest wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 74. South wind 5 to 10 mph.
Tuesday
Sunny, with a high near 98.
Tuesday Night
Mostly clear, with a low around 75.
Wednesday
Sunny and hot, with a high near 99.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
Mostly sunny and hot, with a high near 99.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Kyle TX
 29.97°N 97.92°W (Elev. 650 ft)
Last Update:
4:44 pm CDT Jul 23, 2026
Forecast Valid:
5pm CDT Jul 23, 2026-6pm CDT Jul 30, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation