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

91°F

33°C

Humidity 56%
Wind Speed S 13 mph
Barometer 30.10 in (1018.2 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 19 Jun 12:56 pm CDT
Extended Forecast for

San Marcos TX

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 94. Heat index values as high as 103. South southeast wind around 10 mph.

    High: 94 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 75. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Partly Cloudy

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 93. Heat index values as high as 100. South wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 93 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 74. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 93. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 93 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 74. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 74 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 94. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 94 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 94. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 94 °F

    Mostly Sunny

Detailed Forecast

Juneteenth
Mostly sunny, with a high near 94. Heat index values as high as 103. South southeast wind around 10 mph.
Tonight
Partly cloudy, with a low around 75. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 93. Heat index values as high as 100. South wind 5 to 15 mph, with gusts as high as 20 mph.
Friday Night
Partly cloudy, with a low around 74. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday
Mostly sunny, with a high near 93. South wind 5 to 15 mph, with gusts as high as 25 mph.
Saturday Night
Partly cloudy, with a low around 74. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Sunday
Mostly sunny, with a high near 94. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 74. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Monday
Mostly sunny, with a high near 94. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Partly cloudy, with a low around 73.
Tuesday
Mostly sunny, with a high near 94.
Tuesday Night
Mostly clear, with a low around 73.
Wednesday
Mostly sunny, with a high near 94.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.91°W (Elev. 597 ft)
Last Update:
1:24 pm CDT Jun 19, 2025
Forecast Valid:
1pm CDT Jun 19, 2025-6pm CDT Jun 25, 2025
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation