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.

Fair with Haze

90°F

32°C

Humidity 58%
Wind Speed SE 15 mph
Barometer 30.01 in (1015.4 mb)
Dewpoint 73°F (23°C)
Visibility 4.00 mi
Heat Index99°F (37°C)
Last update 8 Jul 7:56 pm CDT
Extended Forecast for

2 Miles WSW San Marcos TX

  • Tonight

    Tonight: Mostly clear, with a low around 75. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 96. Heat index values as high as 101. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 96 °F

    Sunny

  • Thursday Night

    Thursday Night: 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 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 101. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 93 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 77. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 94. South southeast wind 5 to 10 mph. Chance of precipitation is 40%.

    High: 94 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 75. South southeast wind 5 to 10 mph.

    Low: 75 °F

    Partly Cloudy

  • Sunday

    Sunday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 94. Calm wind becoming south southeast around 5 mph in the morning. Chance of precipitation is 20%.

    High: 94 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 76. South southeast wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 76 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 75. South wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 96. Heat index values as high as 101. South wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly clear, with a low around 75. South wind 5 to 15 mph, with gusts as high as 20 mph.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 101. South wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Partly cloudy, with a low around 77. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 94. South southeast wind 5 to 10 mph. Chance of precipitation is 40%.
Saturday Night
Partly cloudy, with a low around 75. South southeast wind 5 to 10 mph.
Sunday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 94. Calm wind becoming south southeast around 5 mph in the morning. Chance of precipitation is 20%.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 76. South southeast wind 5 to 10 mph. Chance of precipitation is 20%.
Monday
A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 94. Chance of precipitation is 20%.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Tuesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 90.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
Wednesday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 93.
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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:
6:44 pm CDT Jul 8, 2026
Forecast Valid:
8pm CDT Jul 8, 2026-6pm CDT Jul 15, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation