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

68°F

20°C

Humidity 96%
Wind Speed SE 10 mph
Barometer 30.18 in (1021.4 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 11 Apr 12:56 am CDT
Extended Forecast for

4 Miles SSW San Marcos TX

  • Overnight

    Overnight: A 20 percent chance of showers. Mostly cloudy, with a low around 66. Southeast wind around 5 mph.

    Low: 66 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 10am. Patchy fog between 8am and 11am. Otherwise, mostly cloudy, with a high near 82. Southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.

    High: 82 °F

    Chance
    Showers and
    Patchy Fog
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A 50 percent chance of showers and thunderstorms. Patchy fog after 4am. Otherwise, increasing clouds, with a low around 69. South southeast wind 10 to 15 mph, with gusts as high as 20 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    Chance
    T-storms then
    Chance
    Showers and
    Patchy Fog

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. Patchy fog before 11am. Otherwise, cloudy, with a high near 79. South southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    High: 79 °F

    Showers
    Likely and
    Patchy Fog
    then T-storms
    Likely

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm before 1am, then a slight chance of showers and thunderstorms between 1am and 4am, then a slight chance of showers after 4am. Patchy fog between 9pm and 3am. Otherwise, cloudy, with a low around 68. South southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

    Low: 68 °F

    Showers
    Likely and
    Patchy Fog

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 84. South wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 84 °F

    Patchy Fog
    then Chance
    T-storms

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 68. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 83. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 83 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 68. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 68 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of showers. Mostly cloudy, with a low around 66. Southeast wind around 5 mph.
Saturday
A chance of showers, with thunderstorms also possible after 10am. Patchy fog between 8am and 11am. Otherwise, mostly cloudy, with a high near 82. Southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
A 50 percent chance of showers and thunderstorms. Patchy fog after 4am. Otherwise, increasing clouds, with a low around 69. South southeast wind 10 to 15 mph, with gusts as high as 20 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers likely and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. Patchy fog before 11am. Otherwise, cloudy, with a high near 79. South southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Sunday Night
Showers likely and possibly a thunderstorm before 1am, then a slight chance of showers and thunderstorms between 1am and 4am, then a slight chance of showers after 4am. Patchy fog between 9pm and 3am. Otherwise, cloudy, with a low around 68. South southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 84. South wind 10 to 15 mph, with gusts as high as 20 mph.
Monday Night
Mostly cloudy, with a low around 68. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
Mostly cloudy, with a high near 83. South wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 68. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 84.
Wednesday Night
Mostly cloudy, with a low around 68.
Thursday
Partly sunny, with a high near 88.
Thursday Night
Partly cloudy, with a low around 68.
Friday
Partly sunny, with a high near 88.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW San Marcos TX
 29.83°N 97.94°W (Elev. 610 ft)
Last Update:
1:24 am CDT Apr 11, 2026
Forecast Valid:
1am CDT Apr 11, 2026-6pm CDT Apr 17, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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