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

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

58°F

14°C

Humidity 97%
Wind Speed S 8 mph
Barometer 29.99 in (1014.9 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 28 Feb 5:56 am CST
Extended Forecast for

5 Miles SW San Marcos TX

  • Today

    Today: Areas of fog before 9am. Otherwise, sunny, with a high near 85. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 85 °F

    Areas Fog
    then Sunny

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, increasing clouds, with a low around 60. South wind 5 to 10 mph.

    Low: 60 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 8am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 83. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 83 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 61. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 61 °F

    Increasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 83. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 83 °F

    Mostly Sunny

  • Monday Night

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

    Low: 62 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 87. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 87 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 65. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 65 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely, with thunderstorms also possible after noon. Mostly cloudy, with a high near 82. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 82 °F

    Showers
    Likely

Detailed Forecast

Today
Areas of fog before 9am. Otherwise, sunny, with a high near 85. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Tonight
Patchy fog after 3am. Otherwise, increasing clouds, with a low around 60. South wind 5 to 10 mph.
Sunday
Patchy fog before 8am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 83. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Increasing clouds, with a low around 61. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Monday
Mostly sunny, with a high near 83. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Monday Night
Mostly cloudy, with a low around 62. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
Partly sunny, with a high near 87. South wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 65. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
Showers likely, with thunderstorms also possible after noon. Mostly cloudy, with a high near 82. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 40%.
Thursday
A 40 percent chance of showers. Partly sunny, with a high near 85.
Thursday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 65.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 85.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SW San Marcos TX
 29.81°N 97.99°W (Elev. 653 ft)
Last Update:
6:24 am CST Feb 28, 2026
Forecast Valid:
6am CST Feb 28, 2026-6pm CST Mar 6, 2026
 
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