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.

Mostly Cloudy

83°F

28°C

Humidity 57%
Wind Speed S 18 mph
Barometer 29.94 in (1013.0 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 5 Mar 11:56 am CST
Extended Forecast for

2 Miles W San Marcos Municipal Airport TX

  • This Afternoon

    This Afternoon: A 20 percent chance of showers before 3pm. Mostly sunny, with a high near 85. South southeast wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 85 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms after 3am. Increasing clouds, with a low around 67. South southeast wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 67 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 83. South wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.

    High: 83 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms. Increasing clouds, with a low around 68. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 68 °F

    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after noon. High near 83. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.

    High: 83 °F

    Chance
    Showers then
    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 58. East wind 5 to 10 mph becoming north after midnight. Chance of precipitation is 90%.

    Low: 58 °F

    T-storms then
    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 69. North northeast wind 5 to 10 mph. Chance of precipitation is 80%.

    High: 69 °F

    Showers

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight. Cloudy, with a low around 62. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 62 °F

    Showers
    Likely then
    Chance
    T-storms

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 82 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

This Afternoon
A 20 percent chance of showers before 3pm. Mostly sunny, with a high near 85. South southeast wind 15 to 20 mph, with gusts as high as 30 mph.
Tonight
A 20 percent chance of showers and thunderstorms after 3am. Increasing clouds, with a low around 67. South southeast wind 10 to 15 mph, with gusts as high as 30 mph.
Friday
A chance of showers, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 83. South wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.
Friday Night
A 40 percent chance of showers and thunderstorms. Increasing clouds, with a low around 68. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Saturday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after noon. High near 83. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
Saturday Night
Showers and possibly a thunderstorm. Low around 58. East wind 5 to 10 mph becoming north after midnight. Chance of precipitation is 90%.
Sunday
Showers and possibly a thunderstorm. High near 69. North northeast wind 5 to 10 mph. Chance of precipitation is 80%.
Sunday Night
Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight. Cloudy, with a low around 62. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Monday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. South wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
A chance of showers, with thunderstorms also possible after midnight. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Chance of precipitation is 60%.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
Wednesday
A 30 percent chance of showers. Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles W San Marcos Municipal Airport TX
 29.9°N 97.91°W (Elev. 640 ft)
Last Update:
11:48 am CST Mar 5, 2026
Forecast Valid:
12pm CST Mar 5, 2026-6pm CDT Mar 11, 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