Prolonged Extreme Cold; Eastern U.S. Winter Storm

Another Arctic blast will surge south across the northern Plains tonight, crossing the Midwest and reaching the Gulf Coast Friday night. Dangerously cold temperatures will persist across the eastern U.S. into early February. There is increasing confidence for significant heavy snow across much of the Southern Appalachians, Carolinas, and southern Mid-Atlantic Friday into Sunday. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

72°F

22°C

Humidity 37%
Wind Speed W 13 mph
Barometer 30.04 in (1017.3 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 29 Jan 3:56 pm CST
Extended Forecast for

4 Miles NNW San Marcos Municipal Airport TX

Cold Weather Advisory January 31, 03:00am until January 31, 10:00am
Click here for hazard details and duration
Cold Weather Advisory
  • Tonight

    Tonight: Mostly cloudy, with a low around 35. North wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 35 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 56. North wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 56 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Mostly clear, with a low around 28. North wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 28 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 42. North northeast wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 42 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 20. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 20 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 56. Light and variable wind becoming south southwest 5 to 10 mph in the morning.

    High: 56 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 34. Southwest wind around 5 mph.

    Low: 34 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 64. West wind around 5 mph becoming south southeast in the morning.

    High: 64 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 50. South southeast wind around 5 mph.

    Low: 50 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 35. North wind 10 to 15 mph, with gusts as high as 25 mph.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 56. North wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
Mostly clear, with a low around 28. North wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 42. North northeast wind 5 to 15 mph, with gusts as high as 25 mph.
Saturday Night
Clear, with a low around 20. Northeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 56. Light and variable wind becoming south southwest 5 to 10 mph in the morning.
Sunday Night
Mostly clear, with a low around 34. Southwest wind around 5 mph.
Monday
Mostly sunny, with a high near 64. West wind around 5 mph becoming south southeast in the morning.
Monday Night
Mostly cloudy, with a low around 50. South southeast wind around 5 mph.
Tuesday
Mostly cloudy, with a high near 71.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 49.
Wednesday
A 30 percent chance of showers. Mostly cloudy, with a high near 64.
Wednesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 38.
Thursday
Mostly sunny, with a high near 60.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
4:32 pm CST Jan 29, 2026
4pm CST Jan 29, 2026-6pm CST Feb 5, 2026
 
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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