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.

Fair

96°F

36°C

Humidity 36%
Wind Speed S 5 mph
Barometer 29.92 in (1012.1 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 26 Aug 7:56 pm CDT
Extended Forecast for

Wimberley TX

Heat Advisory August 26, 08:05pm until August 27, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 26, 08:05pm until August 27, 07:00pm

    NOW until 7:00pm Thu

    Heat Advisory

  • Tonight

    Low: 78 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers before 10am, then a chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 100. Heat index values as high as 109. West wind around 5 mph becoming calm. Chance of precipitation is 40%.

    High: 100 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly before 10pm. Partly cloudy, with a low around 75. Southwest wind around 5 mph becoming calm.

    Low: 75 °F

    Chance
    T-storms

  • Friday

    Friday: Mostly sunny, with a high near 97. Heat index values as high as 106. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 97 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 75. East southeast wind around 5 mph becoming calm in the evening.

    Low: 75 °F

    Partly Cloudy

  • Saturday

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

    High: 97 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73. Southeast wind around 5 mph becoming calm after midnight.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 97. Calm wind becoming south around 5 mph in the morning.

    High: 97 °F

    Sunny

Detailed Forecast

Tonight
Partly cloudy, with a low around 78. Calm wind becoming south southwest around 5 mph.
Thursday
A slight chance of showers before 10am, then a chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 100. Heat index values as high as 109. West wind around 5 mph becoming calm. Chance of precipitation is 40%.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly before 10pm. Partly cloudy, with a low around 75. Southwest wind around 5 mph becoming calm.
Friday
Mostly sunny, with a high near 97. Heat index values as high as 106. Calm wind becoming east southeast around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 75. East southeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 73. Southeast wind around 5 mph becoming calm after midnight.
Sunday
Sunny, with a high near 97. Calm wind becoming south around 5 mph in the morning.
Sunday Night
Mostly clear, with a low around 73. Southeast wind around 5 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 74.
Tuesday
Sunny, with a high near 97.
Tuesday Night
Mostly clear, with a low around 74.
Wednesday
Sunny, with a high near 98.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Wimberley TX
 29.99°N 98.1°W (Elev. 817 ft)
Last Update:
7:28 pm CDT Aug 26, 2026
Forecast Valid:
8pm CDT Aug 26, 2026-6pm CDT Sep 2, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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