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

75°F

24°C

Humidity 79%
Wind Speed S 8 mph
Barometer 30.06 in (1016.9 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 11 Oct 10:56 pm CDT
Extended Forecast for

2 Miles E San Marcos TX

  • Tonight

    Tonight: Partly cloudy, with a low around 70. South southeast wind around 5 mph.

    Low: 70 °F

    Partly Cloudy

  • Columbus Day

    Columbus Day: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 92. Heat index values as high as 100. East wind 5 to 10 mph becoming south in the afternoon. Winds could gust as high as 20 mph.

    High: 92 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: Increasing clouds, with a low around 75. South wind around 5 mph.

    Low: 75 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 94. Heat index values as high as 105. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 94 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 75. South southeast wind around 10 mph, with gusts as high as 25 mph.

    Low: 75 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 93 °F

    Partly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 72. South southeast wind 5 to 10 mph, with gusts as high as 30 mph.

    Low: 72 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of showers, mainly after 1pm. Mostly sunny, with a high near 90. South southeast wind around 5 mph.

    High: 90 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after 1am. Mostly clear, with a low around 67. East wind around 5 mph becoming calm.

    Low: 67 °F

    Mostly Clear
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
Partly cloudy, with a low around 70. South southeast wind around 5 mph.
Columbus Day
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 92. Heat index values as high as 100. East wind 5 to 10 mph becoming south in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Increasing clouds, with a low around 75. South wind around 5 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 94. Heat index values as high as 105. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 75. South southeast wind around 10 mph, with gusts as high as 25 mph.
Wednesday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 72. South southeast wind 5 to 10 mph, with gusts as high as 30 mph.
Thursday
A 30 percent chance of showers, mainly after 1pm. Mostly sunny, with a high near 90. South southeast wind around 5 mph.
Thursday Night
A 20 percent chance of showers after 1am. Mostly clear, with a low around 67. East wind around 5 mph becoming calm.
Friday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 82.
Friday Night
Partly cloudy, with a low around 60.
Saturday
Mostly sunny, with a high near 75.
Saturday Night
Mostly clear, with a low around 54.
Sunday
A 20 percent chance of showers. Sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles E San Marcos TX
 29.88°N 97.91°W (Elev. 597 ft)
Last Update:
6:44 pm CDT Oct 11, 2026
Forecast Valid:
11pm CDT Oct 11, 2026-6pm CDT Oct 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

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Chance of Precipitation