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

41°F

5°C

Humidity 86%
Wind Speed NW 9 mph
Barometer 30.47 in (1031.8 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 4 Feb 11:56 pm CST
Extended Forecast for

4 Miles SSW San Marcos TX

  • Overnight

    Overnight: Clear, with a low around 39. North northwest wind around 5 mph.

    Low: 39 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 70. West northwest wind around 5 mph.

    High: 70 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 46. West southwest wind around 5 mph.

    Low: 46 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 80. West wind around 5 mph becoming east northeast in the afternoon.

    High: 80 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 48. Calm wind.

    Low: 48 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 80. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 50. South southeast wind around 5 mph becoming calm after midnight.

    Low: 50 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 77. Calm wind becoming south around 5 mph in the morning.

    High: 77 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 53. South wind around 5 mph.

    Low: 53 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 39. North northwest wind around 5 mph.
Thursday
Sunny, with a high near 70. West northwest wind around 5 mph.
Thursday Night
Clear, with a low around 46. West southwest wind around 5 mph.
Friday
Sunny, with a high near 80. West wind around 5 mph becoming east northeast in the afternoon.
Friday Night
Clear, with a low around 48. Calm wind.
Saturday
Sunny, with a high near 80. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 50. South southeast wind around 5 mph becoming calm after midnight.
Sunday
Partly sunny, with a high near 77. Calm wind becoming south around 5 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 53. South wind around 5 mph.
Monday
Mostly cloudy, with a high near 77.
Monday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 57.
Tuesday
A 30 percent chance of showers. Mostly cloudy, with a high near 77.
Tuesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 55.
Wednesday
Mostly sunny, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW San Marcos TX
 29.83°N 97.94°W (Elev. 610 ft)
Last Update:
11:52 pm CST Feb 4, 2026
Forecast Valid:
12am CST Feb 5, 2026-6pm CST Feb 11, 2026
 
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Additional Resources

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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