National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

90°F

32°C

Humidity 37%
Wind Speed S 14 mph
Barometer 29.95 in (1013.2 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 14 May 3:56 pm CDT
Extended Forecast for

3 Miles NNW San Marcos Municipal Airport TX

  • Tonight

    Tonight: Increasing clouds, with a low around 68. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly cloudy, with a high near 90. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 90 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 70. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 70 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 90. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 90 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 75. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 75 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: Mostly cloudy, with a high near 90. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 90 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 79. South southeast wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 79 °F

    Mostly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 90. South southeast wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 90 °F

    Cloudy then
    Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 78. South southeast wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 78 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Increasing clouds, with a low around 68. South wind around 10 mph, with gusts as high as 20 mph.
Friday
Mostly cloudy, with a high near 90. South wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
Mostly cloudy, with a low around 70. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday
Partly sunny, with a high near 90. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 75. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.
Sunday
Mostly cloudy, with a high near 90. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.
Sunday Night
Mostly cloudy, with a low around 79. South southeast wind 15 to 20 mph, with gusts as high as 30 mph.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 90. South southeast wind 15 to 20 mph, with gusts as high as 30 mph.
Monday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 78. South southeast wind 15 to 20 mph, with gusts as high as 30 mph.
Tuesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 88.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 76.
Wednesday
Showers and thunderstorms likely. Mostly cloudy, with a high near 85. Chance of precipitation is 60%.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Thursday
A 50 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:
3 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
Last Update:
2:42 pm CDT May 14, 2026
Forecast Valid:
4pm CDT May 14, 2026-6pm CDT May 21, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation