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

77°F

25°C

Humidity 100%
Wind Speed S 10 mph
Barometer 29.98 in (1014.6 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 6 Jun 6:56 am CDT
Extended Forecast for

4 Miles NNW San Marcos Municipal Airport TX

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 95. Heat index values as high as 100. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 95 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Increasing clouds, with a low around 75. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 97. Heat index values as high as 105. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 97 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 74. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 98. South wind around 10 mph, with gusts as high as 20 mph.

    High: 98 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 75. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 98. South wind around 10 mph.

    High: 98 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South southeast wind 5 to 10 mph.

    Low: 73 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 90. South southeast wind 5 to 10 mph becoming east in the afternoon. Chance of precipitation is 60%.

    High: 90 °F

    Showers
    Likely

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 95. Heat index values as high as 100. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tonight
Increasing clouds, with a low around 75. South southeast wind around 10 mph, with gusts as high as 20 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 97. Heat index values as high as 105. South wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
Mostly clear, with a low around 74. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 98. South wind around 10 mph, with gusts as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 75. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 98. South wind around 10 mph.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South southeast wind 5 to 10 mph.
Tuesday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 90. South southeast wind 5 to 10 mph becoming east in the afternoon. Chance of precipitation is 60%.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 87.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Thursday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
Last Update:
6:42 am CDT Jun 6, 2025
Forecast Valid:
7am CDT Jun 6, 2025-6pm CDT Jun 12, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation