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

Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

59°F

15°C

Humidity 60%
Wind Speed N 14 mph
Barometer 30.09 in (1018.8 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 7 Dec 4:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Clear, with a low around 40. North wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 40 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 62. North wind 5 to 10 mph becoming east northeast in the afternoon. Winds could gust as high as 20 mph.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 37. East northeast wind around 5 mph becoming calm.

    Low: 37 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 67. Light and variable wind becoming south southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 67 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 47. South southwest wind 5 to 10 mph.

    Low: 47 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 75. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 75 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 48. South wind around 5 mph becoming northwest after midnight.

    Low: 48 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 79. West wind around 5 mph becoming south southwest in the afternoon.

    High: 79 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 48. South wind 5 to 10 mph becoming north after midnight.

    Low: 48 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 40. North wind 10 to 15 mph, with gusts as high as 30 mph.
Monday
Sunny, with a high near 62. North wind 5 to 10 mph becoming east northeast in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Clear, with a low around 37. East northeast wind around 5 mph becoming calm.
Tuesday
Sunny, with a high near 67. Light and variable wind becoming south southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 47. South southwest wind 5 to 10 mph.
Wednesday
Sunny, with a high near 75. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 48. South wind around 5 mph becoming northwest after midnight.
Thursday
Sunny, with a high near 79. West wind around 5 mph becoming south southwest in the afternoon.
Thursday Night
Mostly clear, with a low around 48. South wind 5 to 10 mph becoming north after midnight.
Friday
Sunny, with a high near 66.
Friday Night
Partly cloudy, with a low around 40.
Saturday
Mostly sunny, with a high near 55.
Saturday Night
Partly cloudy, with a low around 40.
Sunday
Partly sunny, with a high near 59.
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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:
5:02 pm CST Dec 7, 2025
Forecast Valid:
5pm CST Dec 7, 2025-6pm CST Dec 14, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation