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

47°F

8°C

Humidity 77%
Wind Speed SW 8 mph
Barometer 30.00 in (1015.5 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 9 Dec 11:56 pm CST
Extended Forecast for

San Marcos TX

  • Overnight

    Overnight: Clear, with a low around 43. Southwest wind 5 to 10 mph.

    Low: 43 °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 41. North wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 41 °F

    Clear

  • Thursday

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

    High: 69 °F

    Sunny

  • Thursday Night

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

    Low: 50 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 75. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 75 °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 77. North wind around 5 mph becoming south in the morning.

    High: 77 °F

    Partly Sunny

  • Saturday Night

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

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 43. 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. Winds could gust as high as 20 mph.
Wednesday Night
Clear, with a low around 41. North wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 69. North wind around 5 mph becoming south southeast in the afternoon.
Thursday Night
Mostly clear, with a low around 50. Southwest wind around 5 mph.
Friday
Mostly sunny, with a high near 75. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Mostly cloudy, with a low around 58. South wind around 5 mph becoming calm.
Saturday
Partly sunny, with a high near 77. North wind around 5 mph becoming south in the morning.
Saturday Night
Partly cloudy, with a low around 57. Southeast wind around 5 mph becoming north northeast 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 63.
Monday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 53.
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
 29.88°N 97.94°W (Elev. 577 ft)
12:16 am CST Dec 10, 2025
12am CST Dec 10, 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