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

89°F

32°C

Humidity 26%
Wind Speed S 16 G 25 mph
Barometer 29.93 in (1012.7 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 22 Mar 1:56 pm CDT
Extended Forecast for

4 Miles WNW San Marcos TX

  • This Afternoon

    This Afternoon: Sunny, with a high near 90. South wind around 15 mph, with gusts as high as 25 mph.

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 57. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 57 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 86. Calm wind becoming east around 5 mph in the afternoon.

    High: 86 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 58. East southeast wind around 5 mph becoming south after midnight.

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 87. South wind 5 to 10 mph.

    High: 87 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 62. South wind 5 to 10 mph.

    Low: 62 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 89. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 89 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 63. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 63 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 91. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 91 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 90. South wind around 15 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 57. South wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 86. Calm wind becoming east around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 58. East southeast wind around 5 mph becoming south after midnight.
Tuesday
Mostly sunny, with a high near 87. South wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 62. South wind 5 to 10 mph.
Wednesday
Mostly sunny, 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 63. South southeast wind around 10 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny, with a high near 91. South wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday Night
Mostly clear, with a low around 61.
Friday
Mostly sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 56.
Saturday
Partly sunny, with a high near 76.
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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:
1:38 pm CDT Mar 22, 2026
Forecast Valid:
2pm CDT Mar 22, 2026-6pm CDT Mar 28, 2026
 
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Additional Resources

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