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.

Fair

70°F

21°C

Humidity 87%
Wind Speed Calm
Barometer 29.99 in (1014.6 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 27 Sep 7:56 am CDT
Extended Forecast for

5 Miles WSW Martindale TX

  • Today

    Today: Mostly sunny, with a high near 97. Heat index values as high as 102. South southwest wind around 5 mph becoming calm.

    High: 97 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 73. East southeast wind around 5 mph becoming south after midnight.

    Low: 73 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 96. Heat index values as high as 102. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 96 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 73. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 73 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Partly sunny, with a high near 95. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 95 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 74. South southeast wind around 15 mph, with gusts as high as 25 mph.

    Low: 74 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 93. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 93 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 73. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.

    Low: 73 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 88. South southeast wind 5 to 10 mph. Chance of precipitation is 80%.

    High: 88 °F

    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 97. Heat index values as high as 102. South southwest wind around 5 mph becoming calm.
Tonight
Mostly cloudy, with a low around 73. East southeast wind around 5 mph becoming south after midnight.
Monday
Mostly sunny, with a high near 96. Heat index values as high as 102. Calm wind becoming east southeast around 5 mph in the afternoon.
Monday Night
Increasing clouds, with a low around 73. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
Partly sunny, with a high near 95. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 74. South southeast wind around 15 mph, with gusts as high as 25 mph.
Wednesday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 93. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 73. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
Thursday
Showers and possibly a thunderstorm. High near 88. South southeast wind 5 to 10 mph. Chance of precipitation is 80%.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Chance of precipitation is 70%.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 83. Chance of precipitation is 60%.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 84.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW Martindale TX
 29.81°N 97.91°W (Elev. 581 ft)
Last Update:
6:42 am CDT Sep 27, 2026
Forecast Valid:
8am CDT Sep 27, 2026-6pm CDT Oct 3, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation