Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

47°F

8°C

Humidity 50%
Wind Speed Calm
Barometer 30.19 in (1021.9 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 7 Feb 3:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 82. North northwest wind around 5 mph becoming southeast in the afternoon.

    High: 82 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 49. Southeast wind around 5 mph becoming calm  after midnight.

    Low: 49 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 76. Light south southwest wind becoming south 5 to 10 mph in the morning.

    High: 76 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 56. South southwest wind around 5 mph.

    Low: 56 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 77. South wind 5 to 10 mph.

    High: 77 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after midnight.  Mostly cloudy, with a low around 60. South wind around 5 mph.

    Low: 60 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: A 50 percent chance of showers.  Mostly cloudy, with a high near 76. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 76 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before midnight.  Partly cloudy, with a low around 57. South wind around 5 mph.

    Low: 57 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 82. Southwest wind around 5 mph.

    High: 82 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 82. North northwest wind around 5 mph becoming southeast in the afternoon.
Tonight
Partly cloudy, with a low around 49. Southeast wind around 5 mph becoming calm after midnight.
Sunday
Mostly sunny, with a high near 76. Light south southwest wind becoming south 5 to 10 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 56. South southwest wind around 5 mph.
Monday
Partly sunny, with a high near 77. South wind 5 to 10 mph.
Monday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 60. South wind around 5 mph.
Tuesday
A 50 percent chance of showers. Mostly cloudy, with a high near 76. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
A 20 percent chance of showers before midnight. Partly cloudy, with a low around 57. South wind around 5 mph.
Wednesday
Mostly sunny, with a high near 82. Southwest wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 57.
Thursday
Partly sunny, with a high near 82.
Thursday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 59.
Friday
A 30 percent chance of showers. Mostly sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
12:45 am CST Feb 7, 2026
4am CST Feb 7, 2026-6pm CST Feb 13, 2026
 
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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