Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds from the Upper Midwest into the Northeast

A prolonged atmospheric river will continue to impact the Pacific Northwest into the Northern Rockies with heavy rainfall, areas of urban and river flooding, landslides, heavy mountain snow, and gusty winds into Thursday. A strong clipper system will bring the threat of heavy snow and high winds across the Upper Midwest/Great Lakes as well as portions of the interior Northeast and Appalachians. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

48°F

9°C

Humidity 68%
Wind Speed SW 7 mph
Barometer 30.01 in (1015.9 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 9 Dec 10:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Clear, with a low around 45. Southwest wind around 5 mph.

    Low: 45 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 72. Southwest wind 5 to 10 mph becoming north northeast in the afternoon. Winds could gust as high as 20 mph.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 42. North wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 42 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 70. North wind around 5 mph becoming south southeast in the afternoon.

    High: 70 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 50. South wind around 5 mph.

    Low: 50 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 76. South southwest wind 5 to 10 mph.

    High: 76 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 58. South wind around 5 mph becoming calm.

    Low: 58 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 78. North wind around 5 mph becoming south in the morning.

    High: 78 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 57. Calm wind becoming north northeast around 5 mph after midnight.

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 45. Southwest wind around 5 mph.
Wednesday
Sunny, with a high near 72. Southwest wind 5 to 10 mph becoming north northeast in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
Clear, with a low around 42. North wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 70. North wind around 5 mph becoming south southeast in the afternoon.
Thursday Night
Mostly clear, with a low around 50. South wind around 5 mph.
Friday
Mostly sunny, with a high near 76. South southwest wind 5 to 10 mph.
Friday Night
Mostly cloudy, with a low around 58. South wind around 5 mph becoming calm.
Saturday
Partly sunny, with a high near 78. North wind around 5 mph becoming south in the morning.
Saturday Night
Partly cloudy, with a low around 57. Calm wind becoming north northeast around 5 mph after midnight.
Sunday
Mostly cloudy, with a high near 66.
Sunday Night
Mostly cloudy, with a low around 49.
Monday
Cloudy, with a high near 64.
Monday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 52.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 69.
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.9°N 97.91°W (Elev. 640 ft)
11:32 pm CST Dec 9, 2025
11pm CST Dec 9, 2025-6pm CST Dec 16, 2025
 
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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