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

51°F

11°C

Humidity 43%
Wind Speed NW 3 mph
Barometer 30.35 in (1027.8 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 30 Jan 5:56 pm CST
Extended Forecast for

3 Miles WSW San Marcos 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 clear, with a low around 30. Light north wind becoming north northeast 5 to 10 mph after midnight.

    Low: 30 °F

    Mostly 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 24. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 24 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 58. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 37. Southwest wind around 5 mph.

    Low: 37 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 66. West southwest wind 5 to 10 mph becoming south in the afternoon. Winds could gust as high as 20 mph.

    High: 66 °F

    Partly Sunny

  • 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 72. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 72 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers.  Mostly cloudy, with a low around 48. South wind 5 to 10 mph becoming north after midnight.

    Low: 48 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 30. Light north wind becoming north northeast 5 to 10 mph after midnight.
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 24. Northeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 58. Calm wind becoming south southwest around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 37. Southwest wind around 5 mph.
Monday
Partly sunny, with a high near 66. West southwest wind 5 to 10 mph becoming south in the afternoon. Winds could gust 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 72. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 48. South wind 5 to 10 mph becoming north after midnight.
Wednesday
Mostly sunny, with a high near 66.
Wednesday Night
Mostly clear, with a low around 38.
Thursday
Sunny, with a high near 63.
Thursday Night
Mostly clear, with a low around 40.
Friday
Mostly sunny, with a high near 69.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW San Marcos TX
 29.86°N 97.97°W (Elev. 646 ft)
5:46 pm CST Jan 30, 2026
6pm CST Jan 30, 2026-6pm CST Feb 6, 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