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

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

The next blast of Arctic air surges south down the Plains, across the Great Lakes and through the Southeast and East Friday through Saturday. This could be longest duration of cold in several decades. Forecast models are being closely monitored for potential of another significant winter storm to impact the eastern United States this coming weekend. Confidence in coastal impacts has increased. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

30°F

-1°C

Humidity 85%
Wind Speed NW 7 mph
Barometer 30.43 in (1030.9 mb)
Dewpoint 26°F (-3°C)
Visibility 3.00 mi
Wind Chill23°F (-5°C)
Last update 27 Jan 10:56 pm CST
Extended Forecast for

4 Miles SSW San Marcos TX

  • Tonight

    Tonight: Clear, with a low around 27. Calm wind becoming west northwest around 5 mph after midnight.

    Low: 27 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 55. North wind around 5 mph.

    High: 55 °F

    Sunny

  • Wednesday Night

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

    Low: 29 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 66. Light southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 66 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 35. North wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 35 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 55. North wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 55 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 28. North wind 5 to 10 mph.

    Low: 28 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 45. North northeast wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 45 °F

    Sunny

  • Saturday Night

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

    Low: 22 °F

    Clear

Detailed Forecast

Tonight
Clear, with a low around 27. Calm wind becoming west northwest around 5 mph after midnight.
Wednesday
Sunny, with a high near 55. North wind around 5 mph.
Wednesday Night
Partly cloudy, with a low around 29. North northeast wind around 5 mph becoming calm.
Thursday
Mostly sunny, with a high near 66. Light southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 35. North wind 5 to 15 mph, with gusts as high as 25 mph.
Friday
Mostly sunny, with a high near 55. North wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
Mostly clear, with a low around 28. North wind 5 to 10 mph.
Saturday
Sunny, with a high near 45. North northeast wind 5 to 15 mph, with gusts as high as 20 mph.
Saturday Night
Clear, with a low around 22. Northeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 53.
Sunday Night
Partly cloudy, with a low around 34.
Monday
Mostly sunny, with a high near 60.
Monday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 46.
Tuesday
A 20 percent chance of showers. Mostly cloudy, with a high near 66.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW San Marcos TX
 29.83°N 97.94°W (Elev. 610 ft)
Last Update:
11:30 pm CST Jan 27, 2026
Forecast Valid:
11pm CST Jan 27, 2026-6pm CST Feb 3, 2026
 
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