National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Late January Extreme Cold; Watching for Another East Coast Storm Threat This Weekend

Well below normal temperatures will continue for the eastern half of the Lower 48 this week. Another blast of arctic air will spread from the Plains through the East/Southeast Friday into Saturday with more record lows expected even into Florida. Forecasts are being monitored for increasing potential of another significant winter storm to impact the eastern United States this coming weekend. Read More >

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

20°F

-7°C

Humidity 92%
Wind Speed Calm
Barometer 30.56 in (1035.3 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Last update 27 Jan 7:56 am CST
Extended Forecast for

4 Miles SSW San Marcos TX

Extreme Cold Warning January 27, 08:52am until January 27, 09:00am
Click here for hazard details and duration
...
  •  
    Extreme Cold Warning January 27, 08:52am until January 27, 09:00am

    NOW until 9:00am Tue

    Extreme Cold Warning

  • Today

    High: 49 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 26. South wind around 5 mph becoming calm.

    Low: 26 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 56. West northwest wind around 5 mph becoming north northeast in the afternoon.

    High: 56 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 29. Northeast wind around 5 mph becoming calm.

    Low: 29 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 62. Light south southwest wind increasing to 5 to 10 mph in the morning.

    High: 62 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 33. West southwest wind 5 to 15 mph becoming north after midnight. Winds could gust as high as 25 mph.

    Low: 33 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 52. North wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 52 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 25. North wind around 10 mph, with gusts as high as 20 mph.

    Low: 25 °F

    Mostly Clear

Detailed Forecast

Today
Mostly sunny, with a high near 49. Calm wind becoming south southwest around 5 mph in the morning.
Tonight
Mostly clear, with a low around 26. South wind around 5 mph becoming calm.
Wednesday
Sunny, with a high near 56. West northwest wind around 5 mph becoming north northeast in the afternoon.
Wednesday Night
Partly cloudy, with a low around 29. Northeast wind around 5 mph becoming calm.
Thursday
Partly sunny, with a high near 62. Light south southwest wind increasing to 5 to 10 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 33. West southwest wind 5 to 15 mph becoming north after midnight. Winds could gust as high as 25 mph.
Friday
Mostly sunny, with a high near 52. North wind 15 to 20 mph, with gusts as high as 30 mph.
Friday Night
Mostly clear, with a low around 25. North wind around 10 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 45. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
Mostly clear, with a low around 20.
Sunday
Sunny, with a high near 52.
Sunday Night
Mostly clear, with a low around 33.
Monday
Mostly sunny, with a high near 60.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW San Marcos TX
 29.83°N 97.94°W (Elev. 610 ft)
Last Update:
6:44 am CST Jan 27, 2026
Forecast Valid:
8am CST Jan 27, 2026-6pm CST Feb 2, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation