Heavy Rain in the Southern U.S.; Winter Storm to Impact the Northern Mid-Atlantic and Interior Northeast

A storm system stretching from the Tennessee Valley to the Gulf Coast will bring a variety of hazards to the Eastern U.S. through Tuesday. On the south side of the system, heavy rain and thunderstorms will persist across the Southern U.S. Further north, a wintry precipitation mix is expected from the Central Appalachians to the interior Northeast through Tuesday. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

40°F

4°C

Humidity 83%
Wind Speed N 9 mph
Barometer 30.17 in (1021.7 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 1 Dec 11:56 pm CST
Extended Forecast for

San Marcos TX

  • Overnight

    Overnight: Partly cloudy, with a low around 34. North wind 5 to 10 mph.

    Low: 34 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 59. North wind around 5 mph becoming east southeast in the afternoon.

    High: 59 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 39. East southeast wind around 5 mph becoming south southwest after midnight.

    Low: 39 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 65. South southwest wind around 5 mph.

    High: 65 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers.  Mostly cloudy, with a low around 46. Light and variable wind becoming north 10 to 15 mph after midnight. Winds could gust as high as 25 mph.

    Low: 46 °F

    Chance
    Showers

  • Thursday

    Thursday: A 40 percent chance of showers.  Cloudy, with a high near 53. North wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 53 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers.  Cloudy, with a low around 38. North wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 38 °F

    Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers before noon.  Mostly cloudy, with a high near 56. North wind around 5 mph becoming south in the afternoon.

    High: 56 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 42. Calm wind becoming west around 5 mph after midnight.

    Low: 42 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 34. North wind 5 to 10 mph.
Tuesday
Sunny, with a high near 59. North wind around 5 mph becoming east southeast in the afternoon.
Tuesday Night
Partly cloudy, with a low around 39. East southeast wind around 5 mph becoming south southwest after midnight.
Wednesday
Mostly cloudy, with a high near 65. South southwest wind around 5 mph.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 46. Light and variable wind becoming north 10 to 15 mph after midnight. Winds could gust as high as 25 mph.
Thursday
A 40 percent chance of showers. Cloudy, with a high near 53. North wind 15 to 20 mph, with gusts as high as 30 mph.
Thursday Night
A 40 percent chance of showers. Cloudy, with a low around 38. North wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
A 20 percent chance of showers before noon. Mostly cloudy, with a high near 56. North wind around 5 mph becoming south in the afternoon.
Friday Night
Mostly cloudy, with a low around 42. Calm wind becoming west around 5 mph after midnight.
Saturday
Mostly sunny, with a high near 70.
Saturday Night
Mostly clear, with a low around 45.
Sunday
Sunny, with a high near 70.
Sunday Night
Mostly clear, with a low around 41.
Monday
Mostly sunny, with a high near 66.
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.91°W (Elev. 597 ft)
11:52 pm CST Dec 1, 2025
12am CST Dec 2, 2025-6pm CST Dec 8, 2025
 
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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