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

64°F

18°C

Humidity 90%
Wind Speed NA
Barometer 30.15 in (1020.5 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 10 Nov 4:56 pm CST
Extended Forecast for

San Marcos TX

  • This Afternoon

    This Afternoon: A 20 percent chance of showers. Mostly cloudy, with a high near 69. Calm wind.

    High: 69 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 57. Calm wind.

    Low: 57 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Veterans Day

    Veterans Day: Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 76. North wind around 5 mph becoming calm.

    High: 76 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 57. Light north northwest wind increasing to 5 to 10 mph after midnight.

    Low: 57 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 75. North wind 5 to 10 mph becoming light north northeast in the afternoon.

    High: 75 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 52. Calm wind.

    Low: 52 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 76. Calm wind becoming south southwest around 5 mph.

    High: 76 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 52. Calm wind.

    Low: 52 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of showers after noon. Mostly sunny, with a high near 71. Light southeast wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 71 °F

    Mostly Sunny
    then Chance
    Showers

Detailed Forecast

This Afternoon
A 20 percent chance of showers. Mostly cloudy, with a high near 69. Calm wind.
Tonight
Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 57. Calm wind.
Veterans Day
Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 76. North wind around 5 mph becoming calm.
Wednesday Night
Partly cloudy, with a low around 57. Light north northwest wind increasing to 5 to 10 mph after midnight.
Thursday
Sunny, with a high near 75. North wind 5 to 10 mph becoming light north northeast in the afternoon.
Thursday Night
Clear, with a low around 52. Calm wind.
Friday
Sunny, with a high near 76. Calm wind becoming south southwest around 5 mph.
Friday Night
Mostly clear, with a low around 52. Calm wind.
Saturday
A 30 percent chance of showers after noon. Mostly sunny, with a high near 71. Light southeast wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Chance of precipitation is 50%.
Sunday
A 50 percent chance of showers. Mostly cloudy, with a high near 70.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 55.
Monday
Partly sunny, with a high near 68.
Monday Night
Partly cloudy, with a low around 52.
Tuesday
Mostly sunny, with a high near 67.
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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:
4:32 pm CST Nov 10, 2026
Forecast Valid:
5pm CST Nov 10, 2026-6pm CST Nov 17, 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