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

56°F

13°C

Humidity 57%
Wind Speed N 15 mph
Barometer 30.33 in (1026.6 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 5 Apr 8:56 am CDT
Extended Forecast for

San Marcos TX

  • Today

    Today: A 20 percent chance of showers before 4pm. Mostly cloudy, with a high near 69. North northeast wind around 15 mph, with gusts as high as 30 mph.

    High: 69 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers before 10pm, then a slight chance of showers after 4am. Mostly cloudy, with a low around 51. North northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 51 °F

    Slight Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 71. Northeast wind 5 to 10 mph.

    High: 71 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 48. East northeast wind around 5 mph becoming calm in the evening.

    Low: 48 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 72. North northeast wind around 5 mph becoming east southeast in the afternoon.

    High: 72 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 53. East wind around 5 mph becoming calm after midnight.

    Low: 53 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 75 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 59. Southeast wind around 5 mph becoming calm after midnight.

    Low: 59 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81. Light east southeast wind becoming southeast 5 to 10 mph in the morning.

    High: 81 °F

    Cloudy then
    Slight Chance
    T-storms

Detailed Forecast

Today
A 20 percent chance of showers before 4pm. Mostly cloudy, with a high near 69. North northeast wind around 15 mph, with gusts as high as 30 mph.
Tonight
A slight chance of showers before 10pm, then a slight chance of showers after 4am. Mostly cloudy, with a low around 51. North northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 71. Northeast wind 5 to 10 mph.
Monday Night
Partly cloudy, with a low around 48. East northeast wind around 5 mph becoming calm in the evening.
Tuesday
Mostly cloudy, with a high near 72. North northeast wind around 5 mph becoming east southeast in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 53. East wind around 5 mph becoming calm after midnight.
Wednesday
Mostly sunny, with a high near 75. Calm wind becoming southeast around 5 mph in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 59. Southeast wind around 5 mph becoming calm after midnight.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81. Light east southeast wind becoming southeast 5 to 10 mph in the morning.
Thursday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 63.
Friday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Saturday
A 40 percent chance of showers and thunderstorms. Cloudy, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
8:44 am CDT Apr 5, 2026
Forecast Valid:
9am CDT Apr 5, 2026-6pm CDT Apr 11, 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