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

69°F

21°C

Humidity 55%
Wind Speed Calm
Barometer 30.02 in (1015.8 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 1 Oct 12:56 am CDT
Extended Forecast for

San Marcos TX

  • Overnight

    Overnight: Clear, with a low around 64. Calm wind.

    Low: 64 °F

    Clear

  • Wednesday

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

    High: 95 °F

    Sunny

  • Wednesday Night

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

    Low: 65 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 95. Calm wind becoming east around 5 mph.

    High: 95 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 67. East wind around 5 mph becoming calm in the evening.

    Low: 67 °F

    Mostly Clear

  • Friday

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

    High: 93 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 66. East wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 91. Calm wind becoming east around 5 mph in the afternoon.

    High: 91 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 66. East southeast wind around 5 mph becoming calm after midnight.

    Low: 66 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 64. Calm wind.
Wednesday
Sunny, with a high near 95. Calm wind becoming south around 5 mph.
Wednesday Night
Mostly clear, with a low around 65. East northeast wind around 5 mph becoming calm.
Thursday
Sunny, with a high near 95. Calm wind becoming east around 5 mph.
Thursday Night
Mostly clear, with a low around 67. East wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 93. Calm wind becoming east around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 66. East wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 91. Calm wind becoming east around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 66. East southeast wind around 5 mph becoming calm after midnight.
Sunday
Sunny, with a high near 92.
Sunday Night
Mostly clear, with a low around 68.
Monday
A 20 percent chance of showers. Mostly sunny, with a high near 91.
Monday Night
Partly cloudy, with a low around 69.
Tuesday
A 20 percent chance of showers. Mostly sunny, with a high near 91.
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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:
12:42 am CDT Oct 1, 2025
Forecast Valid:
1am CDT Oct 1, 2025-6pm CDT Oct 7, 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