National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Tracking Weekend Storm Impacts

A storm and trailing cold front will continue to slowly move through the Gulf Coast and Southeast U.S. through this weekend with widespread rain showers and isolated thunderstorms. Some snow and a wintry mix is occurring today to the north. A fast-moving clipper storm may bring several inches of snow to the north-central Plains, Midwest, eastern Great Lakes, and Northeast regions this weekend. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

44°F

7°C

Humidity 83%
Wind Speed E 6 mph
Barometer 30.14 in (1020.6 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 5 Dec 7:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Cloudy, with a high near 56. Calm wind becoming south around 5 mph in the afternoon.

    High: 56 °F

    Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. Southwest wind around 5 mph.

    Low: 45 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 72. West southwest wind around 5 mph.

    High: 72 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 51. South wind around 5 mph becoming west after midnight.

    Low: 51 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 69. West wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph.

    High: 69 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 38. North wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 38 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 60. North wind 5 to 10 mph becoming east in the afternoon.

    High: 60 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 37. East wind around 5 mph becoming calm in the evening.

    Low: 37 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 66. South southwest wind around 5 mph.

    High: 66 °F

    Sunny

Detailed Forecast

Today
Cloudy, with a high near 56. Calm wind becoming south around 5 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 45. Southwest wind around 5 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 72. West southwest wind around 5 mph.
Saturday Night
Mostly clear, with a low around 51. South wind around 5 mph becoming west after midnight.
Sunday
Sunny, with a high near 69. West wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph.
Sunday Night
Clear, with a low around 38. North wind 10 to 15 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 60. North wind 5 to 10 mph becoming east in the afternoon.
Monday Night
Clear, with a low around 37. East wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 66. South southwest wind around 5 mph.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
Sunny, with a high near 73.
Wednesday Night
Mostly clear, with a low around 46.
Thursday
Sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
6:42 am CST Dec 5, 2025
Forecast Valid:
8am CST Dec 5, 2025-6pm CST Dec 11, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation