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.

A Few Clouds

64°F

18°C

Humidity 78%
Wind Speed S 5 mph
Barometer 30.10 in (1018.6 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 24 Mar 2:56 am CDT
Extended Forecast for

4 Miles WNW San Marcos TX

  • Overnight

    Overnight: Partly cloudy, with a low around 58. South southwest wind around 5 mph.

    Low: 58 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Patchy fog before 10am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 86. South wind 5 to 10 mph.

    High: 86 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 63. South southeast wind 5 to 10 mph.

    Low: 63 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Patchy fog before 8am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 89. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 89 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 62. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 89. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 89 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 62. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 89. South wind 5 to 10 mph.

    High: 89 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 58. East wind 5 to 10 mph becoming north northeast after midnight.

    Low: 58 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 58. South southwest wind around 5 mph.
Tuesday
Patchy fog before 10am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 86. South wind 5 to 10 mph.
Tuesday Night
Increasing clouds, with a low around 63. South southeast wind 5 to 10 mph.
Wednesday
Patchy fog before 8am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 89. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 62. South southeast wind around 10 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny, with a high near 89. South wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday Night
Mostly clear, with a low around 62. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Friday
Mostly sunny, with a high near 89. South wind 5 to 10 mph.
Friday Night
Mostly clear, with a low around 58. East wind 5 to 10 mph becoming north northeast after midnight.
Saturday
Mostly sunny, with a high near 79.
Saturday Night
Mostly clear, with a low around 54.
Sunday
Sunny, with a high near 83.
Sunday Night
Partly cloudy, with a low around 57.
Monday
Partly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW San Marcos TX
 29.9°N 97.99°W (Elev. 850 ft)
Last Update:
2:42 am CDT Mar 24, 2026
Forecast Valid:
3am CDT Mar 24, 2026-6pm CDT Mar 30, 2026
 
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