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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 >

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

33°F

1°C

Humidity 78%
Wind Speed W 8 mph
Barometer 30.38 in (1029.0 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 30 Jan 11:56 pm CST
Extended Forecast for

2 Miles W 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

  • Overnight

    Overnight: Clear, with a low around 28. Light north wind becoming north northeast 5 to 10 mph. Winds could gust as high as 20 mph.

    Low: 28 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 46. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 46 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 23. Northeast wind around 5 mph becoming calm in the evening.

    Low: 23 °F

    Clear

  • Sunday

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

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36. Southwest wind around 5 mph.

    Low: 36 °F

    Mostly Clear

  • Monday

    Monday: Mostly cloudy, with a high near 66. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 66 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 55. South wind around 10 mph.

    Low: 55 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 74. South wind 5 to 15 mph becoming east in the afternoon. Winds could gust as high as 25 mph.

    High: 74 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 45. North wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 45 °F

    Chance
    Showers

Detailed Forecast

Overnight
Clear, with a low around 28. Light north wind becoming north northeast 5 to 10 mph. Winds could gust as high as 20 mph.
Saturday
Sunny, with a high near 46. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday Night
Clear, with a low around 23. Northeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 58. Light and variable wind becoming south southwest 5 to 10 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 36. Southwest wind around 5 mph.
Monday
Mostly cloudy, with a high near 66. South wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Mostly cloudy, with a low around 55. South wind around 10 mph.
Tuesday
Mostly cloudy, with a high near 74. South wind 5 to 15 mph becoming east in the afternoon. Winds could gust as high as 25 mph.
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 45. North wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 65.
Wednesday Night
Mostly clear, with a low around 37.
Thursday
Sunny, with a high near 64.
Thursday Night
Mostly clear, with a low around 40.
Friday
Sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles W San Marcos Municipal Airport TX
 29.9°N 97.91°W (Elev. 640 ft)
Last Update:
11:44 pm CST Jan 30, 2026
Forecast Valid:
12am CST Jan 31, 2026-6pm CST Feb 6, 2026
 
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