Another Arctic Blast in the East; Eastern U.S. Winter Storm

A powerful Arctic blast will bring dangerously cold, record low temperatures to the upper Ohio Valley, Mid-Atlantic, Gulf Coast and Southeast U.S. this weekend. A rapidly deepening storm will produce widespread heavy snow and wind from the southern Appalachians across the Carolinas and southern Virginia into Sunday. Storm-force winds and coastal flooding will be possible along the East Coast. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

27°F

-3°C

Humidity 58%
Wind Speed NE 7 mph
Barometer 30.52 in (1033.8 mb)
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 31 Jan 10:56 pm CST
Extended Forecast for

San Marcos Municipal Airport TX

  • Tonight

    Tonight: Clear, with a low around 23. Calm wind.

    Low: 23 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 58. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 35. West southwest wind around 5 mph.

    Low: 35 °F

    Mostly Clear

  • Monday

    Monday: Increasing clouds, with a high near 68. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 68 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 56. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers after noon.  Mostly cloudy, with a high near 72. South southwest wind around 10 mph becoming north in the afternoon. Winds could gust as high as 20 mph.

    High: 72 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 44. North wind around 10 mph, with gusts as high as 20 mph.

    Low: 44 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 66. North northeast wind around 10 mph, with gusts as high as 20 mph.

    High: 66 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 37. North northeast wind 5 to 10 mph.

    Low: 37 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 23. Calm wind.
Sunday
Sunny, with a high near 58. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 35. West southwest wind around 5 mph.
Monday
Increasing clouds, with a high near 68. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly cloudy, with a low around 56. South wind around 10 mph, with gusts as high as 20 mph.
Tuesday
A 20 percent chance of showers after noon. Mostly cloudy, with a high near 72. South southwest wind around 10 mph becoming north in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 44. North wind around 10 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 66. North northeast wind around 10 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 37. North northeast wind 5 to 10 mph.
Thursday
Sunny, with a high near 67.
Thursday Night
Mostly clear, with a low around 40.
Friday
Sunny, with a high near 75.
Friday Night
Mostly clear, with a low around 42.
Saturday
Sunny, with a high near 74.
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos Municipal Airport TX
 29.88°N 97.86°W (Elev. 600 ft)
11:34 pm CST Jan 31, 2026
11pm CST Jan 31, 2026-6pm CST Feb 7, 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