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

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Partly Cloudy

97°F

36°C

Humidity 42%
Wind Speed S 14 mph
Barometer 29.86 in (1010.3 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index104°F (40°C)
Last update 29 Jul 5:56 pm CDT
Extended Forecast for

3 Miles WSW Kyle TX

  • Tonight

    Tonight: Increasing clouds, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Partly sunny, then gradually becoming sunny and hot, with a high near 99. Heat index values as high as 104. South southwest wind 5 to 10 mph.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 75. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny and hot, with a high near 99. Heat index values as high as 106. South southwest wind 5 to 10 mph.

    High: 99 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 76. South wind around 5 mph.

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 99. Southwest wind around 5 mph.

    High: 99 °F

    Hot

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 77. Calm wind becoming west southwest around 5 mph after midnight.

    Low: 77 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. West northwest wind around 5 mph becoming north northeast in the afternoon.

    High: 96 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 76. Northeast wind around 5 mph becoming calm in the evening.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Partly sunny, then gradually becoming sunny and hot, with a high near 99. Heat index values as high as 104. South southwest wind 5 to 10 mph.
Thursday Night
Increasing clouds, with a low around 75. South wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
Mostly cloudy, then gradually becoming sunny and hot, with a high near 99. Heat index values as high as 106. South southwest wind 5 to 10 mph.
Friday Night
Mostly clear, with a low around 76. South wind around 5 mph.
Saturday
Mostly sunny and hot, with a high near 99. Southwest wind around 5 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 77. Calm wind becoming west southwest around 5 mph after midnight.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. West northwest wind around 5 mph becoming north northeast in the afternoon.
Sunday Night
Mostly clear, with a low around 76. Northeast wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 97.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Sunny, with a high near 97.
Tuesday Night
Mostly clear, with a low around 76.
Wednesday
Mostly sunny, with a high near 97.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Kyle TX
 29.97°N 97.92°W (Elev. 650 ft)
Last Update:
2:49 pm CDT Jul 29, 2026
Forecast Valid:
6pm CDT Jul 29, 2026-6pm CDT Aug 5, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation