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

84°F

29°C

Humidity 40%
Wind Speed SE 20 G 28 mph
Barometer 29.96 in (1013.8 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 1 Mar 4:56 pm CST
Extended Forecast for

4 Miles WNW San Marcos TX

  • Tonight

    Tonight: Increasing clouds, with a low around 61. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 61 °F

    Increasing
    Clouds

  • Monday

    Monday: Cloudy through mid morning, then gradual clearing, with a high near 82. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 82 °F

    Gradual
    Clearing

  • Monday Night

    Monday Night: Increasing clouds, with a low around 61. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 61 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Cloudy through mid morning, then gradual clearing, with a high near 87. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 87 °F

    Gradual
    Clearing

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 65. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 65 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 9am. Mostly cloudy, with a high near 85. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    High: 85 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 65 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A 20 percent chance of showers before noon. Partly sunny, with a high near 85. South wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 85 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 66 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
Increasing clouds, with a low around 61. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Monday
Cloudy through mid morning, then gradual clearing, with a high near 82. South wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Increasing clouds, with a low around 61. South southeast wind around 10 mph, with gusts as high as 20 mph.
Tuesday
Cloudy through mid morning, then gradual clearing, with a high near 87. South wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 65. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
A chance of showers, with thunderstorms also possible after 9am. Mostly cloudy, with a high near 85. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. South southeast wind around 10 mph, with gusts as high as 20 mph.
Thursday
A 20 percent chance of showers before noon. Partly sunny, with a high near 85. South wind 10 to 15 mph, with gusts as high as 30 mph.
Thursday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Friday
A 40 percent chance of showers. Partly sunny, with a high near 84.
Friday Night
Showers likely. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.
Saturday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 77. Chance of precipitation is 70%.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 59. Chance of precipitation is 60%.
Sunday
Showers and thunderstorms likely. Mostly cloudy, with a high near 74. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW San Marcos TX
 29.9°N 97.99°W (Elev. 850 ft)
Last Update:
5:44 pm CST Mar 1, 2026
Forecast Valid:
5pm CST Mar 1, 2026-6pm CDT Mar 8, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation