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

58°F

14°C

Humidity 97%
Wind Speed NE 9 mph
Barometer 30.24 in (1023.8 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 20 Apr 4:56 pm CDT
Extended Forecast for

4 Miles WNW San Marcos TX

  • This Afternoon

    This Afternoon: Showers and possibly a thunderstorm. High near 61. East northeast wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 61 °F

    Showers

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then showers likely and possibly a thunderstorm after 4am. Low around 57. East northeast wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 57 °F

    Showers

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm, mainly before 4pm, then a chance of showers and thunderstorms after 4pm. High near 67. East wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 67 °F

    Showers

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms. Cloudy, with a low around 63. Southeast wind 5 to 10 mph.

    Low: 63 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80. South southeast wind around 5 mph.

    High: 80 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 65. South southeast wind 5 to 10 mph.

    Low: 65 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 83. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 83 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 68. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 87. South southwest wind 5 to 10 mph.

    High: 87 °F

    Cloudy then
    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
Showers and possibly a thunderstorm. High near 61. East northeast wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then showers likely and possibly a thunderstorm after 4am. Low around 57. East northeast wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday
Showers and possibly a thunderstorm, mainly before 4pm, then a chance of showers and thunderstorms after 4pm. High near 67. East wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Cloudy, with a low around 63. Southeast wind 5 to 10 mph.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80. South southeast wind around 5 mph.
Wednesday Night
Mostly cloudy, with a low around 65. South southeast wind 5 to 10 mph.
Thursday
Mostly cloudy, with a high near 83. South wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 68. South southeast wind around 10 mph, with gusts as high as 20 mph.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 87. South southwest wind 5 to 10 mph.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 68.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 87.
Saturday Night
Mostly cloudy, with a low around 68.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 87.
Sunday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Monday
A slight chance of showers and thunderstorms. Mostly cloudy, with a high near 88.
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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:
5:32 pm CDT Apr 20, 2026
Forecast Valid:
5pm CDT Apr 20, 2026-6pm CDT Apr 27, 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