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

Snow Squalls May Impact New Year's Eve Travel from the Great Lakes to the Mid-Atlantic; Heavy Rain & Isolated Severe Thunderstorms in Southern California

Snow squalls are likely to cross the Lower Great Lakes this evening and the Ohio Valley through the interior Northeast/northern Mid-Atlantic overnight, before potentially reaching the I-95 corridor from D.C. to New York City early New Year’s Day morning. Heavy rain and isolated severe thunderstorms will impact coastal southern California including Los Angeles tonight into early on New Year's Day. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

40°F

4°C

Humidity 58%
Wind Speed Calm
Barometer 30.12 in (1020.1 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 1 Jan 5:56 am CST
Extended Forecast for

San Marcos TX

  • New Year's Day

    New Year's Day: Mostly sunny, with a high near 73. Southwest wind 5 to 10 mph, with gusts as high as 25 mph.

    High: 73 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 55. South southwest wind around 10 mph.

    Low: 55 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 86. West wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 86 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 57. West wind around 5 mph.

    Low: 57 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 76. Northwest wind 5 to 10 mph becoming north northeast in the afternoon. Winds could gust as high as 20 mph.

    High: 76 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 46. North northeast wind around 5 mph.

    Low: 46 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 73. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 73 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 52. South wind around 5 mph.

    Low: 52 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 74. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 74 °F

    Partly Sunny

Detailed Forecast

New Year's Day
Mostly sunny, with a high near 73. Southwest wind 5 to 10 mph, with gusts as high as 25 mph.
Tonight
Mostly cloudy, then gradually becoming clear, with a low around 55. South southwest wind around 10 mph.
Friday
Sunny, with a high near 86. West wind 10 to 15 mph, with gusts as high as 20 mph.
Friday Night
Clear, with a low around 57. West wind around 5 mph.
Saturday
Sunny, with a high near 76. Northwest wind 5 to 10 mph becoming north northeast in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
Clear, with a low around 46. North northeast wind around 5 mph.
Sunday
Sunny, with a high near 73. Calm wind becoming southeast around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 52. South wind around 5 mph.
Monday
Partly sunny, with a high near 74. South wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 58.
Wednesday
Partly sunny, with a high near 78.
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
5:42 am CST Jan 1, 2026
Forecast Valid:
6am CST Jan 1, 2026-6pm CST Jan 7, 2026
 
Forecast Discussion
 
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