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 with Haze

103°F

39°C

Humidity 24%
Wind Speed S 7 mph
Barometer 29.96 in (1013.5 mb)
Dewpoint 60°F (16°C)
Visibility 2.50 mi
Heat Index104°F (40°C)
Last update 22 Aug 5:56 pm CDT
Extended Forecast for

5 Miles SSE Driftwood TX

Heat Advisory August 22, 06:16pm until August 23, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 22, 06:16pm until August 23, 07:00pm

    NOW until 7:00pm Sun

    Heat Advisory

  • Tonight

    Low: 76 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 102. West southwest wind around 5 mph becoming south southeast in the afternoon.

    High: 102 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 101. Heat index values as high as 104. Southwest wind around 5 mph.

    High: 101 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 74 °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 75. South wind 5 to 10 mph.

    Low: 75 °F

    Mostly Clear

  • Wednesday

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

    High: 103 °F

    Hot

Detailed Forecast

Tonight
Mostly clear, with a low around 76. Southeast wind around 5 mph becoming southwest after midnight.
Sunday
Sunny and hot, with a high near 102. West southwest wind around 5 mph becoming south southeast in the afternoon.
Sunday Night
Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.
Monday
Sunny and hot, with a high near 101. Heat index values as high as 104. Southwest wind around 5 mph.
Monday Night
Mostly clear, with a low around 74. 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 75. South wind 5 to 10 mph.
Wednesday
Sunny and hot, with a high near 103. Southwest wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 76. South wind around 5 mph.
Thursday
Mostly sunny and hot, with a high near 102.
Thursday Night
Partly cloudy, with a low around 76.
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 99.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSE Driftwood TX
 30.04°N 98°W (Elev. 948 ft)
Last Update:
5:46 pm CDT Aug 22, 2026
Forecast Valid:
6pm CDT Aug 22, 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