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

Tracking Atmospheric River for the West Coast; Space Weather Storming Continues

An atmospheric river will bring threats of gusty to high winds and heavy rainfall to California mainly Thursday into Saturday which may bring areas of flooding and wind damage. Heavy snow will be possible over the Sierra Nevada mountains Thursday into Friday associated with the atmospheric river. Minor to severe geomagnetic storming (space weather) is expected to continue into early Thursday. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

65°F

18°C

Humidity 81%
Wind Speed S 5 mph
Barometer 30.17 in (1021.1 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 12 Nov 10:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 60. South wind around 5 mph.

    Low: 60 °F

    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 83. South wind 5 to 10 mph, with gusts as high as 25 mph.

    High: 83 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 61. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 61 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy through mid morning, then gradual clearing, with a high near 84. South wind 5 to 10 mph, with gusts as high as 25 mph.

    High: 84 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 61. South wind 5 to 10 mph.

    Low: 61 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 84. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 84 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64. South wind around 5 mph.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 85. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 85 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 65. South wind 5 to 10 mph.

    Low: 65 °F

    Partly Cloudy

Detailed Forecast

Tonight
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 60. South wind around 5 mph.
Thursday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 83. South wind 5 to 10 mph, with gusts as high as 25 mph.
Thursday Night
Partly cloudy, with a low around 61. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
Mostly cloudy through mid morning, then gradual clearing, with a high near 84. South wind 5 to 10 mph, with gusts as high as 25 mph.
Friday Night
Mostly clear, with a low around 61. South wind 5 to 10 mph.
Saturday
Mostly sunny, with a high near 84. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
Mostly clear, with a low around 64. South wind around 5 mph.
Sunday
Mostly sunny, with a high near 85. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 65. South wind 5 to 10 mph.
Monday
Mostly sunny, with a high near 86.
Monday Night
Partly cloudy, with a low around 67.
Tuesday
Mostly sunny, with a high near 85.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Wednesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 81.
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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:
11:36 pm CST Nov 12, 2025
Forecast Valid:
11pm CST Nov 12, 2025-6pm CST Nov 19, 2025
 
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Additional Resources

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Chance of Precipitation