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

76°F

24°C

Humidity 47%
Wind Speed S 15 mph
Barometer 30.15 in (1020.6 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 8 Feb 1:56 pm CST
Extended Forecast for

5 Miles W San Marcos TX

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 77. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 77 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 54. South southwest wind around 5 mph.

    Low: 54 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 81. West southwest wind 5 to 10 mph becoming south in the afternoon.

    High: 81 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 58. South wind 5 to 10 mph.

    Low: 58 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Cloudy, with a high near 74. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 74 °F

    Cloudy

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers, mainly before midnight. Mostly cloudy, with a low around 59. South southeast wind around 5 mph.

    Low: 59 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 77. Southeast wind around 5 mph.

    High: 77 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 57. East wind around 5 mph becoming south after midnight.

    Low: 57 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 81. South wind around 5 mph.

    High: 81 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 77. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tonight
Partly cloudy, with a low around 54. South southwest wind around 5 mph.
Monday
Mostly sunny, with a high near 81. West southwest wind 5 to 10 mph becoming south in the afternoon.
Monday Night
Increasing clouds, with a low around 58. South wind 5 to 10 mph.
Tuesday
Cloudy, with a high near 74. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
A 30 percent chance of showers, mainly before midnight. Mostly cloudy, with a low around 59. South southeast wind around 5 mph.
Wednesday
Mostly sunny, with a high near 77. Southeast wind around 5 mph.
Wednesday Night
Partly cloudy, with a low around 57. East wind around 5 mph becoming south after midnight.
Thursday
Mostly sunny, with a high near 81. South wind around 5 mph.
Thursday Night
Partly cloudy, with a low around 58.
Friday
Mostly sunny, with a high near 81.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58.
Saturday
A 40 percent chance of showers. Partly sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles W San Marcos TX
 29.88°N 98.02°W (Elev. 797 ft)
Last Update:
2:32 pm CST Feb 8, 2026
Forecast Valid:
2pm CST Feb 8, 2026-6pm CST Feb 14, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation