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

53°F

12°C

Humidity 69%
Wind Speed N 13 mph
Barometer 30.19 in (1021.9 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 7 Dec 7:56 pm CST
Extended Forecast for

2 Miles WSW San Marcos TX

  • Tonight

    Tonight: Clear, with a low around 39. North wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 39 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 63. North wind 5 to 10 mph becoming east northeast in the afternoon. Winds could gust as high as 20 mph.

    High: 63 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 36. East northeast wind around 5 mph becoming calm.

    Low: 36 °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 around 5 mph.

    Low: 47 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 76. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 76 °F

    Sunny

  • Wednesday Night

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

    Low: 48 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 79. West wind 5 to 10 mph becoming south southwest in the afternoon.

    High: 79 °F

    Sunny

  • Thursday Night

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

    Low: 48 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 39. North wind 10 to 15 mph, with gusts as high as 25 mph.
Monday
Sunny, with a high near 63. 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 36. 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 around 5 mph.
Wednesday
Sunny, with a high near 76. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 48. South southwest wind around 5 mph becoming northwest after midnight.
Thursday
Sunny, with a high near 79. West wind 5 to 10 mph becoming south southwest in the afternoon.
Thursday Night
Mostly clear, with a low around 48. South southwest wind 5 to 10 mph becoming north after midnight.
Friday
Sunny, with a high near 67.
Friday Night
Partly cloudy, with a low around 39.
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.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW San Marcos TX
 29.86°N 97.97°W (Elev. 646 ft)
Last Update:
7:42 pm CST Dec 7, 2025
Forecast Valid:
8pm CST Dec 7, 2025-6pm CST Dec 14, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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