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

65°F

18°C

Humidity 78%
Wind Speed Calm
Barometer 30.08 in (1017.7 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 30 Jul 5:56 am CDT
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 98. West southwest wind around 5 mph becoming calm in the afternoon.

    High: 98 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 74. Calm wind becoming southwest around 5 mph after midnight.

    Low: 74 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 98. West southwest wind around 5 mph becoming calm.

    High: 98 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 76. South southeast wind around 5 mph.

    Low: 76 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 97. Calm wind becoming southwest around 5 mph.

    High: 97 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 76. East southeast wind around 5 mph becoming south southwest after midnight. Chance of precipitation is 20%.

    Low: 76 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. Calm wind becoming southeast around 5 mph.

    High: 96 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 77. Northeast wind around 5 mph becoming calm.

    Low: 77 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 96. Calm wind becoming south southwest around 5 mph.

    High: 96 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 98. West southwest wind around 5 mph becoming calm in the afternoon.
Tonight
Partly cloudy, with a low around 74. Calm wind becoming southwest around 5 mph after midnight.
Thursday
Mostly sunny, with a high near 98. West southwest wind around 5 mph becoming calm.
Thursday Night
Partly cloudy, with a low around 76. South southeast wind around 5 mph.
Friday
Mostly sunny, with a high near 97. Calm wind becoming southwest around 5 mph.
Friday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 76. East southeast wind around 5 mph becoming south southwest after midnight. Chance of precipitation is 20%.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. Calm wind becoming southeast around 5 mph.
Saturday Night
Partly cloudy, with a low around 77. Northeast wind around 5 mph becoming calm.
Sunday
Mostly sunny, with a high near 96. Calm wind becoming south southwest around 5 mph.
Sunday Night
Partly cloudy, with a low around 77.
Monday
Sunny, with a high near 96.
Monday Night
Partly cloudy, with a low around 76.
Tuesday
Mostly sunny, with a high near 96.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
6:42 am CDT Jul 30, 2025
Forecast Valid:
6am CDT Jul 30, 2025-6pm CDT Aug 5, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation