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

84°F

29°C

Humidity 44%
Wind Speed Vrbl 5 mph
Barometer 30.13 in (1019.6 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 27 Mar 1:56 pm CDT
Extended Forecast for

3 Miles NNW San Marcos Municipal Airport TX

  • This Afternoon

    This Afternoon: Sunny, with a high near 85. Northeast wind around 5 mph.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 55. North wind 15 to 20 mph, with gusts as high as 35 mph.

    Low: 55 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Cloudy, then gradually becoming mostly sunny, with a high near 70. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 70 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 53. North northeast wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 83. Light south southwest wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 83 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 60. South wind 5 to 10 mph.

    Low: 60 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 88. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 88 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 64. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 64 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 87. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 87 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 85. Northeast wind around 5 mph.
Tonight
Increasing clouds, with a low around 55. North wind 15 to 20 mph, with gusts as high as 35 mph.
Saturday
Cloudy, then gradually becoming mostly sunny, with a high near 70. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday Night
Mostly clear, with a low around 53. North northeast wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 83. Light south southwest wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 60. South wind 5 to 10 mph.
Monday
Partly sunny, with a high near 88. South wind 5 to 15 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 64. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
Partly sunny, with a high near 87. South wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 65.
Wednesday
A 20 percent chance of showers. Partly sunny, with a high near 88.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 63.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
Last Update:
1:28 pm CDT Mar 27, 2026
Forecast Valid:
2pm CDT Mar 27, 2026-6pm CDT Apr 2, 2026
 
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