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.

Fair and Breezy

54°F

12°C

Humidity 57%
Wind Speed N 21 mph
Barometer 30.19 in (1022.0 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 10 Jan 3:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: 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

  • Tonight

    Tonight: Partly cloudy, with a low around 37. North wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 37 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 62. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 62 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 40. North northeast wind around 5 mph becoming calm in the evening.

    Low: 40 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 62. North northwest wind around 5 mph becoming southeast in the afternoon.

    High: 62 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 43. South wind around 5 mph becoming west southwest after midnight.

    Low: 43 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 61. Southwest wind around 5 mph.

    High: 61 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 44. Southwest wind around 5 mph.

    Low: 44 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 71. West wind 5 to 10 mph becoming north in the afternoon. Winds could gust as high as 20 mph.

    High: 71 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 59. North wind 15 to 20 mph, with gusts as high as 35 mph.
Tonight
Partly cloudy, with a low around 37. North wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday
Partly sunny, with a high near 62. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Mostly cloudy, with a low around 40. North northeast wind around 5 mph becoming calm in the evening.
Monday
Mostly cloudy, with a high near 62. North northwest wind around 5 mph becoming southeast in the afternoon.
Monday Night
Mostly cloudy, with a low around 43. South wind around 5 mph becoming west southwest after midnight.
Tuesday
Mostly cloudy, with a high near 61. Southwest wind around 5 mph.
Tuesday Night
Partly cloudy, with a low around 44. Southwest wind around 5 mph.
Wednesday
Sunny, with a high near 71. West wind 5 to 10 mph becoming north in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
Clear, with a low around 41.
Thursday
Sunny, with a high near 64.
Thursday Night
Clear, with a low around 40.
Friday
Sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
12:44 am CST Jan 10, 2026
Forecast Valid:
4am CST Jan 10, 2026-6pm CST Jan 16, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

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Chance of Precipitation