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

Storm Systems to Impact the Central and Eastern U.S. Through the Weekend

Two storm systems will track through the central and eastern U.S. today through this weekend with areas of gusty winds, rain and heavy snow. Severe thunderstorms and heavy to excessive rainfall is forecast today from the Lower Mississippi River Valley to the Tennessee Valley. Damaging winds, a few tornadoes, and areas of flooding are possible. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

66°F

19°C

Humidity 47%
Wind Speed N 9 mph
Barometer 30.01 in (1015.8 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 9 Jan 7:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. North northwest wind 5 to 10 mph increasing to 10 to 15 mph after midnight. Winds could gust as high as 30 mph.

    Low: 45 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 59. North wind 15 to 20 mph, with gusts as high as 35 mph.

    High: 59 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 38. North wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 38 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 60. North northeast wind 5 to 10 mph.

    High: 60 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 40. Northeast wind around 5 mph becoming calm.

    Low: 40 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 61. Calm wind becoming south southeast around 5 mph.

    High: 61 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 44. Calm wind becoming west southwest around 5 mph.

    Low: 44 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 63. Calm wind becoming southwest around 5 mph in the morning.

    High: 63 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 44. West southwest wind around 5 mph.

    Low: 44 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 45. North northwest wind 5 to 10 mph increasing to 10 to 15 mph after midnight. Winds could gust as high as 30 mph.
Saturday
Mostly sunny, with a high near 59. North wind 15 to 20 mph, with gusts as high as 35 mph.
Saturday Night
Mostly cloudy, with a low around 38. North wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday
Partly sunny, with a high near 60. North northeast wind 5 to 10 mph.
Sunday Night
Mostly cloudy, with a low around 40. Northeast wind around 5 mph becoming calm.
Monday
Partly sunny, with a high near 61. Calm wind becoming south southeast around 5 mph.
Monday Night
Mostly cloudy, with a low around 44. Calm wind becoming west southwest around 5 mph.
Tuesday
Partly sunny, with a high near 63. Calm wind becoming southwest around 5 mph in the morning.
Tuesday Night
Mostly clear, with a low around 44. West southwest wind around 5 mph.
Wednesday
Sunny, with a high near 72.
Wednesday Night
Clear, with a low around 41.
Thursday
Sunny, with a high near 65.
Thursday Night
Clear, with a low around 41.
Friday
Sunny, with a high near 68.
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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:
5:46 pm CST Jan 9, 2026
Forecast Valid:
8pm CST Jan 9, 2026-6pm CST Jan 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation