National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Winter Weather Brings Dangerous Travel Conditions Across the Northern U.S.

Heavy lake effect snow will persist downwind of the Great Lakes through early Saturday. Snow squalls with heavy snow and gusty winds will create dangerous travel in the Interior Northeast due to low visibility and slippery roads. A major winter storm will bring moderate to heavy, accumulating snow and gusty winds from the eastern Plains to the western Great Lakes today through Saturday. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

67°F

19°C

Humidity 61%
Wind Speed SE 14 mph
Barometer 30.16 in (1021.1 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 28 Nov 4:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Showers likely, mainly after midnight. Cloudy, with a low around 59. Southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 59 °F

    Showers
    Likely

  • Saturday

    Saturday: A chance of showers before 9am, then a slight chance of showers and thunderstorms after 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 75. South wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    High: 75 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 42. Breezy, with a south wind 5 to 10 mph becoming north 15 to 25 mph in the evening. Winds could gust as high as 35 mph. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 42 °F

    Chance
    T-storms then
    Chance
    Showers and
    Breezy

  • Sunday

    Sunday: Mostly cloudy, with a high near 52. North northeast wind 15 to 20 mph, with gusts as high as 35 mph.

    High: 52 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 30 percent chance of showers after midnight. Cloudy, with a low around 40. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 40 °F

    Cloudy then
    Chance
    Showers

  • Monday

    Monday: A 40 percent chance of showers, mainly before noon. Cloudy, with a high near 52. North northeast wind 5 to 10 mph.

    High: 52 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 36. North wind around 5 mph.

    Low: 36 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 58. North wind 5 to 10 mph becoming east in the afternoon.

    High: 58 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 36. East wind around 5 mph becoming calm in the evening.

    Low: 36 °F

    Partly Cloudy

Detailed Forecast

Tonight
Showers likely, mainly after midnight. Cloudy, with a low around 59. Southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
A chance of showers before 9am, then a slight chance of showers and thunderstorms after 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 75. South wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 42. Breezy, with a south wind 5 to 10 mph becoming north 15 to 25 mph in the evening. Winds could gust as high as 35 mph. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Mostly cloudy, with a high near 52. North northeast wind 15 to 20 mph, with gusts as high as 35 mph.
Sunday Night
A 30 percent chance of showers after midnight. Cloudy, with a low around 40. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Monday
A 40 percent chance of showers, mainly before noon. Cloudy, with a high near 52. North northeast wind 5 to 10 mph.
Monday Night
Mostly cloudy, with a low around 36. North wind around 5 mph.
Tuesday
Mostly sunny, with a high near 58. North wind 5 to 10 mph becoming east in the afternoon.
Tuesday Night
Partly cloudy, with a low around 36. East wind around 5 mph becoming calm in the evening.
Wednesday
Mostly cloudy, with a high near 65.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 49.
Thursday
A 40 percent chance of showers. Cloudy, with a high near 61.
Thursday Night
A 30 percent chance of showers. Cloudy, with a low around 49.
Friday
A 20 percent chance of showers. Mostly cloudy, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.91°W (Elev. 597 ft)
Last Update:
5:02 pm CST Nov 28, 2025
Forecast Valid:
5pm CST Nov 28, 2025-6pm CST Dec 5, 2025
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation