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

71°F

22°C

Humidity 73%
Wind Speed NE 7 mph
Barometer 30.04 in (1016.6 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 8 Sep 9:56 pm CDT
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Clear, with a low around 64. East northeast wind around 5 mph becoming calm.

    Low: 64 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 63. East wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 94. Calm wind becoming east around 5 mph in the afternoon.

    High: 94 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 67. East wind around 5 mph becoming calm in the evening.

    Low: 67 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 96. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 96 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 69. East southeast wind around 5 mph becoming calm in the evening.

    Low: 69 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 96. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 96 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 69. Southeast wind around 5 mph becoming calm after midnight.

    Low: 69 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 64. East northeast wind around 5 mph becoming calm.
Tuesday
Sunny, with a high near 93. Calm wind becoming east southeast around 5 mph in the afternoon.
Tuesday Night
Clear, with a low around 63. East wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 94. Calm wind becoming east around 5 mph in the afternoon.
Wednesday Night
Clear, with a low around 67. East wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 96. Calm wind becoming east southeast around 5 mph in the afternoon.
Thursday Night
Clear, with a low around 69. East southeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 96. Calm wind becoming east southeast around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 69. Southeast wind around 5 mph becoming calm after midnight.
Saturday
Sunny, with a high near 96.
Saturday Night
Mostly clear, with a low around 69.
Sunday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 96.
Sunday Night
Mostly clear, with a low around 70.
Monday
Sunny, with a high near 95.
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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:
6:50 pm CDT Sep 8, 2025
Forecast Valid:
10pm CDT Sep 8, 2025-6pm CDT Sep 15, 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