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

73°F

23°C

Humidity 27%
Wind Speed E 7 G 18 mph
Barometer 30.17 in (1021.3 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 6 Apr 4:56 pm CDT
Extended Forecast for

3 Miles WNW San Marcos TX

  • Tonight

    Tonight: Partly cloudy, with a low around 47. Northeast wind around 5 mph becoming calm in the evening.

    Low: 47 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 75. Calm wind becoming east southeast around 5 mph in the morning.

    High: 75 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 52. East wind around 5 mph becoming calm after midnight.

    Low: 52 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 77. Calm wind becoming southeast around 5 mph in the morning.

    High: 77 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 61. Southeast wind around 5 mph.

    Low: 61 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 82. Calm wind becoming southeast around 5 mph in the morning.

    High: 82 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Southeast wind 5 to 10 mph.

    Low: 63 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 80 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 65 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 47. Northeast wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 75. Calm wind becoming east southeast around 5 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 52. East wind around 5 mph becoming calm after midnight.
Wednesday
Partly sunny, with a high near 77. Calm wind becoming southeast around 5 mph in the morning.
Wednesday Night
Mostly cloudy, with a low around 61. Southeast wind around 5 mph.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 82. Calm wind becoming southeast around 5 mph in the morning.
Thursday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Southeast wind 5 to 10 mph.
Friday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Saturday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Sunday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82.
Sunday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Monday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW San Marcos TX
 29.9°N 97.97°W (Elev. 686 ft)
Last Update:
2:46 pm CDT Apr 6, 2026
Forecast Valid:
5pm CDT Apr 6, 2026-6pm CDT Apr 13, 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