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

40°F

4°C

Humidity 45%
Wind Speed NE 14 mph
Barometer 30.65 in (1038.2 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 31 Jan 10:56 am CST
Extended Forecast for

4 Miles NNW San Marcos Municipal Airport TX

  • Today

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

    High: 46 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 22. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 22 °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 65. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 65 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 55. South wind around 10 mph, with gusts as high as 20 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

  • Wednesday

    Wednesday: Mostly sunny, with a high near 64. North wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 64 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 46. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Tonight
Clear, with a low around 22. 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 65. 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, with gusts as high as 20 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 64. North wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 36.
Thursday
Sunny, with a high near 64.
Thursday Night
Mostly clear, with a low around 39.
Friday
Sunny, with a high near 71.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
10:33 am CST Jan 31, 2026
11am CST Jan 31, 2026-6pm CST Feb 6, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database