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

Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds in the North-Central U.S.

A prolonged atmospheric river will continue impacting the Pacific Northwest with heavy rainfall which has lead to areas of urban and river flooding along with gusty winds into Thursday. A clipper will bring heavy snow, some mixed wintry precipitation, and gusty to high winds across the northern Plains, Upper Midwest, and the Great Lakes into Thursday morning. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

57°F

14°C

Humidity 51%
Wind Speed S 10 mph
Barometer 30.20 in (1022.5 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 9 Dec 10:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 67. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 67 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 46. Southwest wind 5 to 10 mph.

    Low: 46 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 72. Southwest wind 5 to 10 mph becoming north northeast in the afternoon.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 44. North wind 5 to 10 mph.

    Low: 44 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 69. North wind around 5 mph becoming south in the afternoon.

    High: 69 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 53. South southwest wind around 5 mph.

    Low: 53 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 76. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 76 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 59. South wind around 5 mph.

    Low: 59 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 78. South wind 5 to 10 mph.

    High: 78 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 67. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tonight
Mostly clear, with a low around 46. Southwest wind 5 to 10 mph.
Wednesday
Sunny, with a high near 72. Southwest wind 5 to 10 mph becoming north northeast in the afternoon.
Wednesday Night
Mostly clear, with a low around 44. North wind 5 to 10 mph.
Thursday
Sunny, with a high near 69. North wind around 5 mph becoming south in the afternoon.
Thursday Night
Partly cloudy, with a low around 53. South southwest wind around 5 mph.
Friday
Partly sunny, with a high near 76. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Partly cloudy, with a low around 59. South wind around 5 mph.
Saturday
Partly sunny, with a high near 78. South wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 56.
Sunday
Mostly cloudy, with a high near 65.
Sunday Night
Mostly cloudy, with a low around 46.
Monday
A 20 percent chance of showers. Mostly cloudy, with a high near 64.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
11:04 am CST Dec 9, 2025
Forecast Valid:
11am CST Dec 9, 2025-6pm CST Dec 15, 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