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

74°F

23°C

Humidity 91%
Wind Speed Calm
Barometer 30.04 in (1016.3 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 19 Sep 2:56 am CDT
Extended Forecast for

Wimberley TX

  • Overnight

    Overnight: Partly cloudy, with a low around 73. Calm wind.

    Low: 73 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 97. Heat index values as high as 101. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 97 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 73. South southeast wind around 5 mph.

    Low: 73 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly sunny, with a high near 98. Heat index values as high as 103. Calm wind becoming south around 5 mph.

    High: 98 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 73. Southeast wind around 5 mph becoming calm.

    Low: 73 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 97. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 97 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. East southeast wind around 5 mph becoming calm.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Sunny, with a high near 96. Calm wind becoming east around 5 mph in the afternoon.

    High: 96 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 73 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
Partly cloudy, with a low around 73. Calm wind.
Saturday
Mostly sunny, with a high near 97. Heat index values as high as 101. Calm wind becoming south southeast around 5 mph in the afternoon.
Saturday Night
Increasing clouds, with a low around 73. South southeast wind around 5 mph.
Sunday
Mostly sunny, with a high near 98. Heat index values as high as 103. Calm wind becoming south around 5 mph.
Sunday Night
Partly cloudy, with a low around 73. Southeast wind around 5 mph becoming calm.
Monday
Sunny, with a high near 97. Calm wind becoming east southeast around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 74. East southeast wind around 5 mph becoming calm.
Tuesday
A 20 percent chance of showers before 1pm. Sunny, with a high near 96. Calm wind becoming east around 5 mph in the afternoon.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 96.
Wednesday Night
Partly cloudy, with a low around 73.
Thursday
Mostly sunny, with a high near 96.
Thursday Night
Partly cloudy, with a low around 72.
Friday
Mostly sunny, with a high near 95.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Wimberley TX
 29.99°N 98.1°W (Elev. 817 ft)
Last Update:
2:44 am CDT Sep 19, 2026
Forecast Valid:
3am CDT Sep 19, 2026-6pm CDT Sep 25, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation