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 32%
Wind Speed SE 8 mph
Barometer 29.95 in (1013.2 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 23 Aug 7:56 pm CDT
Extended Forecast for

2 Miles W San Marcos TX

Heat Advisory August 23, 08:32pm until August 26, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 23, 08:32pm until August 26, 07:00pm

    NOW until 7:00pm Wed

    Heat Advisory

  • Tonight

    Low: 76 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 102. Southwest wind around 5 mph.

    High: 102 °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. Heat index values as high as 107. 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 102. South southwest wind around 5 mph.

    High: 102 °F

    Hot

  • Wednesday Night

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

    Low: 77 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 101. Southwest wind around 5 mph becoming calm in the morning.

    High: 101 °F

    Hot

Detailed Forecast

Tonight
Mostly clear, with a low around 76. South wind 5 to 10 mph.
Monday
Sunny and hot, with a high near 102. Southwest wind around 5 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. Heat index values as high as 107. 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 102. South southwest wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 77. South southwest wind around 5 mph.
Thursday
Sunny and hot, with a high near 101. Southwest wind around 5 mph becoming calm in the morning.
Thursday Night
Partly cloudy, with a low around 77. Southeast wind around 5 mph.
Friday
Mostly sunny and hot, with a high near 100.
Friday Night
Mostly clear, with a low around 76.
Saturday
Mostly sunny and hot, with a high near 99.
Saturday Night
Mostly clear, with a low around 76.
Sunday
Sunny and hot, with a high near 99.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles W San Marcos TX
 29.88°N 97.97°W (Elev. 699 ft)
Last Update:
7:12 pm CDT Aug 23, 2026
Forecast Valid:
8pm CDT Aug 23, 2026-6pm CDT Aug 30, 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