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

69°F

21°C

Humidity 84%
Wind Speed Calm
Barometer 30.03 in (1015.9 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 23 Aug 6:56 am CDT
Extended Forecast for

3 Miles WSW Kyle TX

Heat Advisory August 23, 07:47am until August 26, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 23, 07:47am until August 26, 07:00pm

    NOW until 7:00pm Wed

    Heat Advisory

  • Today

    High: 104 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 76. South southeast wind 5 to 10 mph.

    Low: 76 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 103. Heat index values as high as 107. Southwest wind 5 to 10 mph.

    High: 103 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 75. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 102. South southwest wind around 5 mph.

    High: 102 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 76. South southeast wind 5 to 10 mph.

    Low: 76 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 103. South southwest wind around 5 mph.

    High: 103 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 77. South southwest wind around 5 mph.

    Low: 77 °F

    Mostly Clear

Detailed Forecast

Today
Mostly sunny and hot, with a high near 104. West southwest wind 5 to 10 mph becoming south southeast in the afternoon.
Tonight
Mostly clear, with a low around 76. South southeast wind 5 to 10 mph.
Monday
Sunny and hot, with a high near 103. Heat index values as high as 107. Southwest wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 75. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
Sunny and hot, with a high near 102. South southwest wind around 5 mph.
Tuesday Night
Mostly clear, with a low around 76. South southeast wind 5 to 10 mph.
Wednesday
Sunny and hot, with a high near 103. South southwest wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 77. South southwest wind around 5 mph.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 102. Southwest wind around 5 mph becoming calm in the morning.
Thursday Night
Partly cloudy, with a low around 77.
Friday
Mostly sunny and hot, with a high near 100.
Friday Night
Mostly clear, with a low around 76.
Saturday
Sunny and hot, with a high near 100.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Kyle TX
 29.97°N 97.92°W (Elev. 650 ft)
Last Update:
6:42 am CDT Aug 23, 2026
Forecast Valid:
7am CDT Aug 23, 2026-6pm CDT Aug 29, 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