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.

A Few Clouds

96°F

36°C

Humidity 37%
Wind Speed S 15 G 23 mph
Barometer 30.00 in (1014.8 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 9 Jul 4:56 pm CDT
Extended Forecast for

2 Miles WSW San Marcos TX

  • Tonight

    Tonight: Mostly clear, with a low around 75. South wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Mostly sunny, with a high near 93. South wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 93 °F

    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: A slight chance of showers before 7pm, then a slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 76. South southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 76 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 101. South southeast wind 5 to 10 mph. Chance of precipitation is 50%.

    High: 93 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 76. Southeast wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 76 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 93 °F

    Partly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 76. Southeast wind 5 to 10 mph. Chance of precipitation is 30%.

    Low: 76 °F

    Chance
    T-storms

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 93. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 93 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74. East southeast wind around 5 mph becoming calm after midnight.

    Low: 74 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 75. South wind 5 to 15 mph, with gusts as high as 20 mph.
Friday
A 30 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Mostly sunny, with a high near 93. South wind 5 to 15 mph, with gusts as high as 20 mph.
Friday Night
A slight chance of showers before 7pm, then a slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 76. South southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 101. South southeast wind 5 to 10 mph. Chance of precipitation is 50%.
Saturday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 76. Southeast wind 5 to 10 mph. Chance of precipitation is 20%.
Sunday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Calm wind becoming southeast around 5 mph in the afternoon.
Sunday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 76. Southeast wind 5 to 10 mph. Chance of precipitation is 30%.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 93. Calm wind becoming southeast around 5 mph in the afternoon.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74. East southeast wind around 5 mph becoming calm after midnight.
Tuesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73.
Wednesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.
Wednesday Night
Mostly cloudy, with a low around 74.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW San Marcos TX
 29.86°N 97.97°W (Elev. 646 ft)
Last Update:
5:32 pm CDT Jul 9, 2026
Forecast Valid:
5pm CDT Jul 9, 2026-6pm CDT Jul 16, 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