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

83°F

28°C

Humidity 74%
Wind Speed SE 8 mph
Barometer 29.98 in (1014.5 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 21 Jun 8:56 pm CDT
Extended Forecast for

2 Miles NNE San Marcos TX

  • Tonight

    Tonight: Increasing clouds, with a low around 75. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 75 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly sunny, with a high near 94. Heat index values as high as 101. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 94 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 73. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 73 °F

    Increasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 95. Heat index values as high as 103. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 95 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 71. Southeast wind 10 to 15 mph becoming light south southeast after midnight. Winds could gust as high as 20 mph.

    Low: 71 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 94. Light east southeast wind becoming southeast 5 to 10 mph in the morning.

    High: 94 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 72. Southeast wind 5 to 10 mph becoming light south southeast after midnight.

    Low: 72 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Light east southeast wind becoming southeast 5 to 10 mph in the morning.

    High: 93 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 72. Southeast wind 5 to 10 mph becoming light south southeast after midnight.

    Low: 72 °F

    Partly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 75. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Sunday
Mostly sunny, with a high near 94. Heat index values as high as 101. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Increasing clouds, with a low around 73. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Monday
Mostly sunny, with a high near 95. Heat index values as high as 103. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 71. Southeast wind 10 to 15 mph becoming light south southeast after midnight. Winds could gust as high as 20 mph.
Tuesday
Mostly sunny, with a high near 94. Light east southeast wind becoming southeast 5 to 10 mph in the morning.
Tuesday Night
Mostly clear, with a low around 72. Southeast wind 5 to 10 mph becoming light south southeast after midnight.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Light east southeast wind becoming southeast 5 to 10 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 72. Southeast wind 5 to 10 mph becoming light south southeast after midnight.
Thursday
Mostly sunny, with a high near 93.
Thursday Night
Partly cloudy, with a low around 72.
Friday
Mostly sunny, with a high near 93.
Friday Night
Partly cloudy, with a low around 73.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNE San Marcos TX
 29.9°N 97.91°W (Elev. 640 ft)
Last Update:
7:42 pm CDT Jun 21, 2025
Forecast Valid:
9pm CDT Jun 21, 2025-6pm CDT Jun 28, 2025
 
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Additional Resources

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Chance of Precipitation