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 27%
Wind Speed NE 7 mph
Barometer 30.03 in (1016.0 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 29 Sep 3:56 pm CDT
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Mostly cloudy, with a low around 64. East northeast wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Cloudy

  • Tuesday

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

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 64. Northeast wind around 5 mph becoming calm.

    Low: 64 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 95. Calm wind becoming southwest around 5 mph.

    High: 95 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 65. East wind around 5 mph becoming calm.

    Low: 65 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 94. Calm wind becoming south southwest around 5 mph.

    High: 94 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 68. Southeast wind around 5 mph becoming calm in the evening.

    Low: 68 °F

    Mostly Clear

  • Friday

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

    High: 93 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 68. East wind around 5 mph becoming calm after midnight.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 64. East northeast wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 93. Northwest wind around 5 mph becoming east northeast in the afternoon.
Tuesday Night
Clear, with a low around 64. Northeast wind around 5 mph becoming calm.
Wednesday
Sunny, with a high near 95. Calm wind becoming southwest around 5 mph.
Wednesday Night
Mostly clear, with a low around 65. East wind around 5 mph becoming calm.
Thursday
Sunny, with a high near 94. Calm wind becoming south southwest around 5 mph.
Thursday Night
Mostly clear, with a low around 68. Southeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 93. Calm wind becoming east southeast around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 68. East wind around 5 mph becoming calm after midnight.
Saturday
Sunny, with a high near 92.
Saturday Night
Mostly clear, with a low around 67.
Sunday
Sunny, with a high near 92.
Sunday Night
Mostly clear, with a low around 68.
Monday
A 20 percent chance of showers. Sunny, with a high near 92.
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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 29, 2025
Forecast Valid:
4pm CDT Sep 29, 2025-6pm CDT Oct 6, 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