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

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

60°F

16°C

Humidity 86%
Wind Speed NW 5 mph
Barometer 29.74 in (1006.5 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 20 Feb 12:56 am CST
Extended Forecast for

San Marcos TX

  • Overnight

    Overnight: Mostly cloudy, with a low around 59. North northeast wind around 5 mph.

    Low: 59 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 72. North northeast wind 5 to 10 mph.

    High: 72 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 56. Northeast wind around 5 mph becoming calm.

    Low: 56 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 77. North wind 5 to 15 mph, with gusts as high as 30 mph.

    High: 77 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 41. North wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 41 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 65. North northeast wind around 10 mph, with gusts as high as 20 mph.

    High: 65 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 39. North northeast wind around 5 mph.

    Low: 39 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 67. North northeast wind around 5 mph becoming east southeast in the afternoon.

    High: 67 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 41. East southeast wind around 5 mph becoming south southwest after midnight.

    Low: 41 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 59. North northeast wind around 5 mph.
Friday
Mostly cloudy, with a high near 72. North northeast wind 5 to 10 mph.
Friday Night
Mostly cloudy, with a low around 56. Northeast wind around 5 mph becoming calm.
Saturday
Mostly sunny, with a high near 77. North wind 5 to 15 mph, with gusts as high as 30 mph.
Saturday Night
Mostly clear, with a low around 41. North wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday
Mostly sunny, with a high near 65. North northeast wind around 10 mph, with gusts as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 39. North northeast wind around 5 mph.
Monday
Sunny, with a high near 67. North northeast wind around 5 mph becoming east southeast in the afternoon.
Monday Night
Mostly clear, with a low around 41. East southeast wind around 5 mph becoming south southwest after midnight.
Tuesday
Mostly sunny, with a high near 73.
Tuesday Night
Partly cloudy, with a low around 54.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
Mostly clear, with a low around 57.
Thursday
Sunny, with a high near 86.
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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:
12:45 am CST Feb 20, 2026
Forecast Valid:
1am CST Feb 20, 2026-6pm CST Feb 26, 2026
 
Forecast Discussion
 
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Additional Resources

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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