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 85%
Wind Speed NE 5 mph
Barometer 30.15 in (1020.9 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 5 Dec 5:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Cloudy, with a high near 56. North wind around 5 mph becoming calm.

    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 73. West southwest wind around 5 mph.

    High: 73 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 50. South wind around 5 mph becoming west after midnight.

    Low: 50 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 70. West wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph.

    High: 70 °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 61. North wind 5 to 10 mph becoming east in the afternoon.

    High: 61 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 36. East wind around 5 mph becoming calm in the evening.

    Low: 36 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 67. South southwest wind 5 to 10 mph.

    High: 67 °F

    Sunny

Detailed Forecast

Today
Cloudy, with a high near 56. North wind around 5 mph becoming calm.
Tonight
Mostly cloudy, with a low around 45. Southwest wind around 5 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 73. West southwest wind around 5 mph.
Saturday Night
Mostly clear, with a low around 50. South wind around 5 mph becoming west after midnight.
Sunday
Sunny, with a high near 70. 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 61. North wind 5 to 10 mph becoming east in the afternoon.
Monday Night
Clear, with a low around 36. East wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 67. South southwest wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
Sunny, with a high near 74.
Wednesday Night
Mostly clear, with a low around 45.
Thursday
Sunny, with a high near 73.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.9°N 97.91°W (Elev. 640 ft)
Last Update:
6:42 am CST Dec 5, 2025
Forecast Valid:
6am CST Dec 5, 2025-6pm CST Dec 11, 2025
 
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