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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 >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

45°F

7°C

Humidity 48%
Wind Speed S 6 mph
Barometer 30.40 in (1029.8 mb)
Dewpoint 26°F (-3°C)
Visibility 3.00 mi
Wind Chill42°F (6°C)
Last update 27 Jan 5:56 pm CST
Extended Forecast for

2 Miles W San Marcos Municipal Airport TX

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 26. Calm wind becoming west northwest around 5 mph.

    Low: 26 °F

    Decreasing
    Clouds

  • Wednesday

    Wednesday: Sunny, with a high near 55. Northwest wind around 5 mph becoming north northeast in the afternoon.

    High: 55 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 29. Calm wind.

    Low: 29 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 64. Light and variable wind becoming south southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 64 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 32. North wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 32 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 52. North wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 52 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 26. North wind 5 to 10 mph.

    Low: 26 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 44. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 44 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 21. Northeast wind around 5 mph becoming calm in the evening.

    Low: 21 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 26. Calm wind becoming west northwest around 5 mph.
Wednesday
Sunny, with a high near 55. Northwest wind around 5 mph becoming north northeast in the afternoon.
Wednesday Night
Partly cloudy, with a low around 29. Calm wind.
Thursday
Partly sunny, with a high near 64. Light and variable wind becoming south southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 32. North wind 5 to 15 mph, with gusts as high as 20 mph.
Friday
Mostly sunny, with a high near 52. North wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
Mostly clear, with a low around 26. North wind 5 to 10 mph.
Saturday
Sunny, with a high near 44. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
Mostly clear, with a low around 21. Northeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 52.
Sunday Night
Mostly clear, with a low around 31.
Monday
Sunny, with a high near 62.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
A 20 percent chance of showers. Partly sunny, with a high near 65.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles W San Marcos Municipal Airport TX
 29.9°N 97.91°W (Elev. 640 ft)
Last Update:
5:56 pm CST Jan 27, 2026
Forecast Valid:
6pm CST Jan 27, 2026-6pm CST Feb 3, 2026
 
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