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

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

90°F

32°C

Humidity 34%
Wind Speed E 9 mph
Barometer 30.00 in (1015.0 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 9 Sep 2:56 pm CDT
Extended Forecast for

San Marcos TX

  • This Afternoon

    This Afternoon: Sunny, with a high near 93. East wind around 5 mph.

    High: 93 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 66. East wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 95. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 95 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 69. East wind around 5 mph becoming calm after midnight.

    Low: 69 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 96. Light and variable wind becoming east southeast 5 to 10 mph in the afternoon.

    High: 96 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 70. East southeast wind around 5 mph becoming calm after midnight.

    Low: 70 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 96. Light and variable wind becoming southeast 5 to 10 mph in the morning.

    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

  • Saturday

    Saturday: Sunny, with a high near 96. Light and variable wind becoming southeast 5 to 10 mph in the morning.

    High: 96 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 93. East wind around 5 mph.
Tonight
Clear, with a low around 66. East wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 95. Calm wind becoming east southeast around 5 mph in the afternoon.
Wednesday Night
Clear, with a low around 69. East wind around 5 mph becoming calm after midnight.
Thursday
Sunny, with a high near 96. Light and variable wind becoming east southeast 5 to 10 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 70. East southeast wind around 5 mph becoming calm after midnight.
Friday
Sunny, with a high near 96. Light and variable wind becoming southeast 5 to 10 mph in the morning.
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. Light and variable wind becoming southeast 5 to 10 mph in the morning.
Saturday Night
Mostly clear, with a low around 70.
Sunday
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:
3:32 pm CDT Sep 9, 2025
Forecast Valid:
3pm CDT Sep 9, 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