Heavy Snow in the Northern Plains and Upper Midwest; Severe Thunderstorms in the Southern U.S.

In the north-central U.S., a storm will bring heavy snow and gusty to high winds over parts of the northern Plains and Upper Midwest today before moving across the Great Lakes with heavy lake effect snow Wednesday into Thanksgiving Day. Isolated severe thunderstorms are likely across parts of the Southeast/Deep South, mainly from this morning into early evening. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fog/Mist

70°F

21°C

Humidity 64%
Wind Speed NW 3 mph
Barometer 30.04 in (1017.0 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 25 Nov 9:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 80. North wind around 5 mph.

    High: 80 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 49. North northeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 49 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 64. North northeast wind 5 to 15 mph, with gusts as high as 30 mph.

    High: 64 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 42. North northeast wind around 5 mph becoming calm.

    Low: 42 °F

    Mostly Clear

  • Thanksgiving Day

    Thanksgiving Day: Sunny, with a high near 66. North northeast wind around 5 mph becoming east in the afternoon.

    High: 66 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 47. East wind around 5 mph becoming calm.

    Low: 47 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 69. South southeast wind 5 to 10 mph, with gusts as high as 25 mph.

    High: 69 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 40 percent chance of showers.  Cloudy, with a low around 60. South southeast wind around 10 mph, with gusts as high as 25 mph.

    Low: 60 °F

    Chance
    Showers

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms.  Mostly cloudy, with a high near 74. South southwest wind around 10 mph, with gusts as high as 25 mph.

    High: 74 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 80. North wind around 5 mph.
Tonight
Mostly clear, with a low around 49. North northeast wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 64. North northeast wind 5 to 15 mph, with gusts as high as 30 mph.
Wednesday Night
Mostly clear, with a low around 42. North northeast wind around 5 mph becoming calm.
Thanksgiving Day
Sunny, with a high near 66. North northeast wind around 5 mph becoming east in the afternoon.
Thursday Night
Partly cloudy, with a low around 47. East wind around 5 mph becoming calm.
Friday
Mostly cloudy, with a high near 69. South southeast wind 5 to 10 mph, with gusts as high as 25 mph.
Friday Night
A 40 percent chance of showers. Cloudy, with a low around 60. South southeast wind around 10 mph, with gusts as high as 25 mph.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 74. South southwest wind around 10 mph, with gusts as high as 25 mph.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 51. Chance of precipitation is 40%.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 67.
Sunday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 50.
Monday
A 40 percent chance of showers. Mostly cloudy, with a high near 64.
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
5:42 am CST Nov 25, 2025
10am CST Nov 25, 2025-6pm CST Dec 1, 2025
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database