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

70°F

21°C

Humidity 84%
Wind Speed S 12 mph
Barometer 29.99 in (1014.7 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 4 Mar 11:56 pm CST
Extended Forecast for

3 Miles NNW San Marcos Municipal Airport TX

  • Overnight

    Overnight: Cloudy, with a low around 66. South wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 66 °F

    Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers before 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 85. South southeast wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 85 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after 3am. Increasing clouds, with a low around 65. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 65 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: A slight chance of showers, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 84. South wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

    High: 84 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms, then a chance of showers after midnight. Mostly cloudy, with a low around 66. South southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    Low: 66 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: Showers, with thunderstorms also possible after 3pm. High near 82. South southeast wind around 10 mph becoming east in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 80%.

    High: 82 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 56. North northeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.

    Low: 56 °F

    T-storms

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 70. North northeast wind 5 to 10 mph. Chance of precipitation is 80%.

    High: 70 °F

    Showers

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Cloudy, with a low around 60. Northeast wind around 5 mph becoming calm.

    Low: 60 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Overnight
Cloudy, with a low around 66. South wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday
A 20 percent chance of showers before 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 85. South southeast wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Thursday Night
A 20 percent chance of showers after 3am. Increasing clouds, with a low around 65. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.
Friday
A slight chance of showers, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 84. South wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Friday Night
A slight chance of showers and thunderstorms, then a chance of showers after midnight. Mostly cloudy, with a low around 66. South southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Saturday
Showers, with thunderstorms also possible after 3pm. High near 82. South southeast wind around 10 mph becoming east in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 80%.
Saturday Night
Showers and possibly a thunderstorm. Low around 56. North northeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
Sunday
Showers and possibly a thunderstorm. High near 70. North northeast wind 5 to 10 mph. Chance of precipitation is 80%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Cloudy, with a low around 60. Northeast wind around 5 mph becoming calm.
Monday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after noon. Cloudy, with a high near 81. Chance of precipitation is 70%.
Monday Night
A 40 percent chance of showers and thunderstorms. Cloudy, with a low around 65.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 79. Chance of precipitation is 60%.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 57.
Wednesday
A 20 percent chance of showers. Mostly sunny, with a high near 76.
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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:
11:44 pm CST Mar 4, 2026
Forecast Valid:
12am CST Mar 5, 2026-6pm CDT Mar 11, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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