Powerful Winter Storm from the Upper Midwest into the Northeast; Severe Thunderstorms in the Midwest and Ohio Valley

A rapidly-intensifying storm is expected to bring heavy snow, blizzard conditions, and icing from the Upper Midwest through the Great Lakes and Northeast. Scattered severe thunderstorms may produce severe/damaging wind gusts and a couple of tornadoes across parts of the Midwest and lower Ohio Valley through the evening. Arctic air will expand across the central and southern U.S.. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

77°F

25°C

Humidity 66%
Wind Speed NW 5 mph
Barometer 29.96 in (1014.0 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 28 Dec 2:56 pm CST
Extended Forecast for

5 Miles SW San Marcos TX

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

    This Afternoon: Mostly sunny, with a high near 79. Southwest wind around 5 mph.

    High: 79 °F

    Mostly Sunny

  • Tonight

    Tonight: A 20 percent chance of showers before midnight.  Mostly cloudy, with a low around 44. Breezy, with a light and variable wind becoming north northeast 20 to 25 mph in the evening. Winds could gust as high as 45 mph.

    Low: 44 °F

    Slight Chance
    Showers then
    Mostly Cloudy
    and Breezy

  • Monday

    Monday: Mostly cloudy, with a high near 49. Breezy, with a north northeast wind 15 to 25 mph, with gusts as high as 40 mph.

    High: 49 °F

    Partly Sunny
    and Breezy
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 38. North wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 38 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 56. North wind 5 to 10 mph.

    High: 56 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 34. Calm wind becoming west around 5 mph.

    Low: 34 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 64. South southwest wind around 5 mph.

    High: 64 °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 70. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 70 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 79. Southwest wind around 5 mph.
Tonight
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 44. Breezy, with a light and variable wind becoming north northeast 20 to 25 mph in the evening. Winds could gust as high as 45 mph.
Monday
Mostly cloudy, with a high near 49. 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 38. North wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
Mostly sunny, with a high near 56. North wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 34. Calm wind becoming west around 5 mph.
Wednesday
Mostly sunny, with a high near 64. South southwest wind around 5 mph.
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 70. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Partly cloudy, with a low around 53.
Friday
Sunny, with a high near 80.
Friday Night
Mostly clear, with a low around 52.
Saturday
Sunny, with a high near 75.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SW San Marcos TX
 29.81°N 97.99°W (Elev. 653 ft)
2:50 pm CST Dec 28, 2025
3pm 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