Significant Winter Storm to Bring Heavy Snow and Ice Impacts; Dangerously Cold Temperatures Expands Across the East; Severe Storm Threat in the Gulf States Sunday

A significant winter storm is underway, bringing widespread heavy snow, sleet, and freezing rain from the Southern Rockies to New England through Monday. Extremely cold air will follow, prolonging dangerous travel and infrastructure impacts into next week. Severe thunderstorms may produce damaging gusts and tornadoes across the eastern Gulf Coast states Sunday morning and afternoon. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast with Haze

29°F

-2°C

Humidity 78%
Wind Speed N 15 mph
Barometer 30.22 in (1023.6 mb)
Dewpoint 23°F (-5°C)
Visibility 3.00 mi
Wind Chill18°F (-8°C)
Last update 25 Jan 2:56 pm CST
Extended Forecast for

San Marcos TX

Extreme Cold Warning January 25, 03:14pm until January 26, 12:00pm
Click here for hazard details and duration
Extreme Cold Warning
  •  
    Extreme Cold Warning January 25, 03:14pm until January 26, 12:00pm

    NOW until 12:00pm Mon

    Extreme Cold Warning

  • This Afternoon

    High: 31 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 17. North wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 17 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 35. North wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 35 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 15. North wind around 5 mph becoming calm  in the evening.

    Low: 15 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 45. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 45 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 24. Calm wind becoming northwest around 5 mph after midnight.

    Low: 24 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 50. North wind around 5 mph.

    High: 50 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 27. North wind around 5 mph becoming calm.

    Low: 27 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 31. North northwest wind around 15 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 17. North wind 10 to 15 mph, with gusts as high as 25 mph.
Monday
Sunny, with a high near 35. North wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 15. North wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 45. Calm wind becoming south southwest around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 24. Calm wind becoming northwest around 5 mph after midnight.
Wednesday
Sunny, with a high near 50. North wind around 5 mph.
Wednesday Night
Partly cloudy, with a low around 27. North wind around 5 mph becoming calm.
Thursday
Partly sunny, with a high near 53. Calm wind becoming south southeast around 5 mph in the morning.
Thursday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 38.
Friday
A 30 percent chance of showers. Mostly cloudy, with a high near 48.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 26.
Saturday
Mostly sunny, with a high near 42.
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
2:46 pm CST Jan 25, 2026
3pm CST Jan 25, 2026-6pm CST Jan 31, 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