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

75°F

24°C

Humidity 82%
Wind Speed S 13 mph
Barometer 29.92 in (1012.4 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 6 Mar 11:56 pm CST
Extended Forecast for

2 Miles W San Marcos Municipal Airport TX

  • Overnight

    Overnight: Cloudy, with a low around 69. South wind around 10 mph.

    Low: 69 °F

    Cloudy

  • Saturday

    Saturday: A chance of showers before noon, then a chance of showers and thunderstorms between noon and 3pm, then showers and possibly a thunderstorm after 3pm. High near 83. South southeast wind around 10 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 83 °F

    Chance
    Showers then
    Showers

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely, mainly before 9pm. Cloudy, with a low around 56. North wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 56 °F

    T-storms
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Cloudy, with a high near 71. North wind 5 to 10 mph. Chance of precipitation is 60%.

    High: 71 °F

    Showers
    Likely then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight, then a slight chance of showers and thunderstorms after midnight. Cloudy, with a low around 61. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 61 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 9am. Cloudy, with a high near 83. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 40%.

    High: 83 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms after midnight. Cloudy, with a low around 67. South southeast wind around 10 mph.

    Low: 67 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 83. South wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 83 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 61. South southeast wind 5 to 15 mph becoming southwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%.

    Low: 61 °F

    Showers
    Likely

Detailed Forecast

Overnight
Cloudy, with a low around 69. South wind around 10 mph.
Saturday
A chance of showers before noon, then a chance of showers and thunderstorms between noon and 3pm, then showers and possibly a thunderstorm after 3pm. High near 83. South southeast wind around 10 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers and thunderstorms likely, mainly before 9pm. Cloudy, with a low around 56. North wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Cloudy, with a high near 71. North wind 5 to 10 mph. Chance of precipitation is 60%.
Sunday Night
A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight, then a slight chance of showers and thunderstorms after midnight. Cloudy, with a low around 61. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Monday
A chance of showers, with thunderstorms also possible after 9am. Cloudy, with a high near 83. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 40%.
Monday Night
A 20 percent chance of showers and thunderstorms after midnight. Cloudy, with a low around 67. South southeast wind around 10 mph.
Tuesday
A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 83. South wind 10 to 15 mph, with gusts as high as 30 mph.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 61. South southeast wind 5 to 15 mph becoming southwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%.
Wednesday
A 30 percent chance of showers, mainly before noon. Sunny, with a high near 81.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 49.
Thursday
Sunny, with a high near 70.
Thursday Night
Clear, with a low around 44.
Friday
Sunny, with a high near 77.
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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:
12:28 am CST Mar 7, 2026
Forecast Valid:
12am CST Mar 7, 2026-6pm CDT Mar 13, 2026
 
Forecast Discussion
 
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Additional Resources

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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