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

Tracking Two Storms Impacting the Northern U.S. Through Thanksgiving and into This Weekend

Heavy lake effect snow, gusty winds, and localized blizzard conditions will persist through Thanksgiving near and downwind of the Great Lakes. Rain and mountain snow are forecast for the Pacific Northwest. Confidence is increasing for another winter storm to develop over the northern and central Rockies Friday and track across the central Plains through the Midwest and Great Lakes this weekend. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Mostly Cloudy

49°F

9°C

Humidity 59%
Wind Speed Calm
Barometer 30.38 in (1028.5 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 28 Nov 3:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: A 20 percent chance of showers after 3pm. Mostly cloudy, with a high near 66. East wind 5 to 10 mph becoming south southeast in the afternoon. Winds could gust as high as 25 mph.

    High: 66 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tonight

    Tonight: Showers likely, mainly between 9pm and 3am. 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 and thunderstorms before noon, then a slight chance of showers between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 76. South wind 5 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.

    High: 76 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 42. West southwest wind 5 to 10 mph becoming north 15 to 20 mph in the evening. Winds could gust as high as 30 mph. Chance of precipitation is 40%.

    Low: 42 °F

    Chance
    Showers

  • Sunday

    Sunday: Mostly cloudy, with a high near 51. North northeast wind 15 to 20 mph, with gusts as high as 35 mph.

    High: 51 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 20 percent chance of showers after midnight. Cloudy, with a low around 37. North northeast wind around 10 mph, with gusts as high as 25 mph.

    Low: 37 °F

    Cloudy then
    Slight Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers before noon. Cloudy, with a high near 50. North northeast wind 5 to 10 mph.

    High: 50 °F

    Slight Chance
    Showers then
    Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 33. North wind around 5 mph.

    Low: 33 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 56. North wind around 5 mph becoming east southeast in the afternoon.

    High: 56 °F

    Sunny

Detailed Forecast

Today
A 20 percent chance of showers after 3pm. Mostly cloudy, with a high near 66. East wind 5 to 10 mph becoming south southeast in the afternoon. Winds could gust as high as 25 mph.
Tonight
Showers likely, mainly between 9pm and 3am. 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 and thunderstorms before noon, then a slight chance of showers between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 76. South wind 5 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 42. West southwest wind 5 to 10 mph becoming north 15 to 20 mph in the evening. Winds could gust as high as 30 mph. Chance of precipitation is 40%.
Sunday
Mostly cloudy, with a high near 51. North northeast wind 15 to 20 mph, with gusts as high as 35 mph.
Sunday Night
A 20 percent chance of showers after midnight. Cloudy, with a low around 37. North northeast wind around 10 mph, with gusts as high as 25 mph.
Monday
A 20 percent chance of showers before noon. Cloudy, with a high near 50. North northeast wind 5 to 10 mph.
Monday Night
Mostly cloudy, with a low around 33. North wind around 5 mph.
Tuesday
Sunny, with a high near 56. North wind around 5 mph becoming east southeast in the afternoon.
Tuesday Night
Partly cloudy, with a low around 38.
Wednesday
Partly sunny, with a high near 64.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 51.
Thursday
A 30 percent chance of showers. Cloudy, with a high near 62.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
4:32 am CST Nov 28, 2025
Forecast Valid:
4am CST Nov 28, 2025-6pm CST Dec 4, 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