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

53°F

12°C

Humidity 72%
Wind Speed Calm
Barometer 30.16 in (1020.8 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 7 Apr 1:56 am CDT
Extended Forecast for

2 Miles SW San Marcos Municipal Airport TX

  • Overnight

    Overnight: Partly cloudy, with a low around 47. Calm wind.

    Low: 47 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 76. Calm wind becoming east around 5 mph in the morning.

    High: 76 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 52. East wind around 5 mph becoming calm in the evening.

    Low: 52 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 78. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 78 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 61. Southeast wind around 5 mph becoming calm after midnight.

    Low: 61 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. Light east southeast wind becoming southeast 5 to 10 mph in the morning.

    High: 82 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Southeast wind 5 to 10 mph.

    Low: 63 °F

    Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 79. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

    High: 79 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 64. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 64 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
Partly cloudy, with a low around 47. Calm wind.
Tuesday
Partly sunny, with a high near 76. Calm wind becoming east around 5 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 52. East wind around 5 mph becoming calm in the evening.
Wednesday
Partly sunny, with a high near 78. Calm wind becoming southeast around 5 mph in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 61. Southeast wind around 5 mph becoming calm after midnight.
Thursday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. Light east southeast wind becoming southeast 5 to 10 mph in the morning.
Thursday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Southeast wind 5 to 10 mph.
Friday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 79. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 64. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 81.
Saturday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Sunday
A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 82.
Sunday Night
A 20 percent chance of showers and thunderstorms. Cloudy, with a low around 68.
Monday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SW San Marcos Municipal Airport TX
 29.88°N 97.89°W (Elev. 597 ft)
Last Update:
1:46 am CDT Apr 7, 2026
Forecast Valid:
2am CDT Apr 7, 2026-6pm CDT Apr 13, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation