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.

Thunderstorm in Vicinity

28°C

83°F

Humidity 94%
Wind Speed Calm
Barometer 1014.3 mb (29.98 in)
Dewpoint 27°C (81°F)
Visibility 16 km
Heat Index36°C (96°F)
Last update 3 Jul 1:56 pm CDT
Extended Forecast for

4 Miles SSW San Marcos TX

  • This Afternoon

    This Afternoon: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 31. Southeast wind around 15 km/h, with gusts as high as 30 km/h. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.

    High: 31 °C

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 10pm, then a slight chance of showers. Mostly cloudy, with a low around 24. Southeast wind 10 to 15 km/h. Chance of precipitation is 30%.

    Low: 24 °C

    Chance
    T-storms then
    Slight Chance
    Showers

  • Independence Day

    Independence Day: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 32. South southeast wind 10 to 20 km/h, with gusts as high as 35 km/h. Chance of precipitation is 30%.

    High: 32 °C

    Chance
    Showers then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 23. South wind 10 to 15 km/h. Chance of precipitation is 20%.

    Low: 23 °C

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers and thunderstorms before 7am, then a slight chance of showers between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 32. South southeast wind 10 to 15 km/h, with gusts as high as 30 km/h. Chance of precipitation is 30%.

    High: 32 °C

    Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 23. South southeast wind 5 to 15 km/h.

    Low: 23 °C

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 33. South wind 5 to 10 km/h.

    High: 33 °C

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 22. South southwest wind 5 to 10 km/h.

    Low: 22 °C

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 34. South southwest wind 5 to 10 km/h becoming southeast in the afternoon.

    High: 34 °C

    Mostly Sunny

Detailed Forecast

This Afternoon
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 31. Southeast wind around 15 km/h, with gusts as high as 30 km/h. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.
Tonight
A chance of showers and thunderstorms before 10pm, then a slight chance of showers. Mostly cloudy, with a low around 24. Southeast wind 10 to 15 km/h. Chance of precipitation is 30%.
Independence Day
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 32. South southeast wind 10 to 20 km/h, with gusts as high as 35 km/h. Chance of precipitation is 30%.
Friday Night
A slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 23. South wind 10 to 15 km/h. Chance of precipitation is 20%.
Saturday
A slight chance of showers and thunderstorms before 7am, then a slight chance of showers between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 32. South southeast wind 10 to 15 km/h, with gusts as high as 30 km/h. Chance of precipitation is 30%.
Saturday Night
Mostly cloudy, with a low around 23. South southeast wind 5 to 15 km/h.
Sunday
Partly sunny, with a high near 33. South wind 5 to 10 km/h.
Sunday Night
Partly cloudy, with a low around 22. South southwest wind 5 to 10 km/h.
Monday
Mostly sunny, with a high near 34. South southwest wind 5 to 10 km/h becoming southeast in the afternoon.
Monday Night
Mostly clear, with a low around 22.
Tuesday
Sunny, with a high near 35.
Tuesday Night
Partly cloudy, with a low around 23.
Wednesday
Sunny, with a high near 36.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW San Marcos TX
 29.83°N 97.94°W (Elev. 610 m)
Last Update:
1:50 pm CDT Jul 3, 2025
Forecast Valid:
2pm CDT Jul 3, 2025-6pm CDT Jul 9, 2025
 
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