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

60°F

16°C

Humidity 72%
Wind Speed SE 5 mph
Barometer 30.26 in (1024.4 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 19 Apr 10:56 pm CDT
Extended Forecast for

4 Miles WNW San Marcos TX

  • Tonight

    Tonight: A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Cloudy, with a low around 54. Southeast wind around 5 mph becoming calm. Chance of precipitation is 40%.

    Low: 54 °F

    Chance
    Showers

  • Monday

    Monday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 63. East wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 63 °F

    Showers
    Likely

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Cloudy, with a low around 57. East wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 57 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm. Cloudy, with a high near 68. East wind 5 to 10 mph. Chance of precipitation is 70%.

    High: 68 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am. Cloudy, with a low around 63. East southeast wind 5 to 10 mph.

    Low: 63 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80. South southeast wind 5 to 10 mph.

    High: 80 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 66. Southeast wind 5 to 10 mph.

    Low: 66 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 83. South wind around 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

Detailed Forecast

Tonight
A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Cloudy, with a low around 54. Southeast wind around 5 mph becoming calm. Chance of precipitation is 40%.
Monday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 63. East wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 57. East wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 68. East wind 5 to 10 mph. Chance of precipitation is 70%.
Tuesday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Cloudy, with a low around 63. East southeast wind 5 to 10 mph.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80. South southeast wind 5 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 66. Southeast wind 5 to 10 mph.
Thursday
Mostly cloudy, with a high near 83. South wind around 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 86.
Friday Night
Mostly cloudy, with a low around 67.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85.
Saturday Night
Mostly cloudy, with a low around 67.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83.
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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:
8:46 pm CDT Apr 19, 2026
Forecast Valid:
11pm CDT Apr 19, 2026-6pm CDT Apr 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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