Tracking Late December Winter Storm Expected to Impact the Northern Plains through the Northeast U.S.

A winter storm system will rapidly intensify over the Midwest on Sunday and track through the Great Lakes on Monday. Periods of heavy snow are anticipated across the Upper Great Lakes late Sunday and continuing into Monday. At least 1/10 inch of ice accumulation is expected from a wintry mix across much of the interior Northeast U.S. starting Sunday afternoon. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

68°F

20°C

Humidity 93%
Wind Speed S 12 mph
Barometer 29.92 in (1012.6 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 28 Dec 3:56 am CST
Extended Forecast for

San Marcos TX

Wind Advisory December 28, 06:00pm until December 29, 12:00pm
Click here for hazard details and duration
Wind Advisory
  • Today

    Today: Cloudy, then gradually becoming mostly sunny, with a high near 79. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 79 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: A 20 percent chance of showers before 9pm.  Mostly cloudy, with a low around 43. Breezy, with a west southwest wind 5 to 10 mph becoming north northeast 15 to 25 mph in the evening. Winds could gust as high as 40 mph.

    Low: 43 °F

    Slight Chance
    Showers then
    Mostly Cloudy
    and Breezy

  • Monday

    Monday: Mostly cloudy, with a high near 51. Breezy, with a north northeast wind 15 to 25 mph, with gusts as high as 40 mph.

    High: 51 °F

    Partly Sunny
    and Breezy
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 39. North wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 39 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 54. North wind 5 to 10 mph.

    High: 54 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 36. Calm wind.

    Low: 36 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 58. Calm wind becoming southwest around 5 mph in the morning.

    High: 58 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 41. South southwest wind around 5 mph.

    Low: 41 °F

    Partly Cloudy

  • New Year's Day

    New Year's Day: Partly sunny, with a high near 67. South southwest wind 5 to 10 mph.

    High: 67 °F

    Partly Sunny

Detailed Forecast

Today
Cloudy, then gradually becoming mostly sunny, with a high near 79. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tonight
A 20 percent chance of showers before 9pm. Mostly cloudy, with a low around 43. Breezy, with a west southwest wind 5 to 10 mph becoming north northeast 15 to 25 mph in the evening. Winds could gust as high as 40 mph.
Monday
Mostly cloudy, with a high near 51. Breezy, with a north northeast wind 15 to 25 mph, with gusts as high as 40 mph.
Monday Night
Mostly cloudy, with a low around 39. North wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
Mostly sunny, with a high near 54. North wind 5 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 36. Calm wind.
Wednesday
Mostly sunny, with a high near 58. Calm wind becoming southwest around 5 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 41. South southwest wind around 5 mph.
New Year's Day
Partly sunny, with a high near 67. South southwest wind 5 to 10 mph.
Thursday Night
Partly cloudy, with a low around 51.
Friday
Mostly sunny, with a high near 75.
Friday Night
Partly cloudy, with a low around 55.
Saturday
Mostly sunny, with a high near 80.
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
4:08 am CST Dec 28, 2025
4am CST Dec 28, 2025-6pm CST Jan 3, 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