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.

Overcast

64°F

18°C

Humidity 100%
Wind Speed Calm
Barometer 29.97 in (1014.3 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 28 Mar 3:56 am CDT
Extended Forecast for

San Marcos Municipal Airport TX

  • Overnight

    Overnight: Showers likely and possibly a thunderstorm. Cloudy, with a low around 60. South southeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 60 °F

    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms, mainly between 10am and 4pm. Cloudy, with a high near 74. South southeast wind around 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 74 °F

    Showers
    Likely then
    Chance
    T-storms

  • Friday Night

    Friday Night: A 10 percent chance of showers and thunderstorms before 7pm. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 62. South southeast wind around 5 mph.

    Low: 62 °F

    Slight Chance
    T-storms then
    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 10am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 83. South wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 83 °F

    Patchy Fog
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 64. South southeast wind 5 to 10 mph.

    Low: 64 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 84. South wind 5 to 10 mph.

    High: 84 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 60. South wind around 5 mph becoming west southwest after midnight.

    Low: 60 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 80. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 80 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 54. Northeast wind 5 to 10 mph.

    Low: 54 °F

    Partly Cloudy

Detailed Forecast

Overnight
Showers likely and possibly a thunderstorm. Cloudy, with a low around 60. South southeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Showers likely and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms, mainly between 10am and 4pm. Cloudy, with a high near 74. South southeast wind around 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
A 10 percent chance of showers and thunderstorms before 7pm. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 62. South southeast wind around 5 mph.
Saturday
Patchy fog before 10am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 83. South wind 5 to 15 mph, with gusts as high as 20 mph.
Saturday Night
Mostly cloudy, with a low around 64. South southeast wind 5 to 10 mph.
Sunday
Partly sunny, with a high near 84. South wind 5 to 10 mph.
Sunday Night
Partly cloudy, with a low around 60. South wind around 5 mph becoming west southwest after midnight.
Monday
Mostly sunny, with a high near 80. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Partly cloudy, with a low around 54. Northeast wind 5 to 10 mph.
Tuesday
Partly sunny, with a high near 82.
Tuesday Night
Mostly cloudy, with a low around 66.
Wednesday
Partly sunny, with a high near 90.
Wednesday Night
Mostly cloudy, with a low around 65.
Thursday
Partly sunny, with a high near 87.
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos Municipal Airport TX
 29.88°N 97.89°W (Elev. 597 ft)
Last Update:
3:48 am CDT Mar 28, 2025
Forecast Valid:
4am CDT Mar 28, 2025-6pm CDT Apr 3, 2025
 
Forecast Discussion
 
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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