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

95°F

35°C

Humidity 39%
Wind Speed SW 5 mph
Barometer 30.05 in (1016.6 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index98°F (37°C)
Last update 25 Aug 12:56 pm CDT
Extended Forecast for

5 Miles NNE Prairie Lea TX

Heat Advisory August 25, 01:46pm until August 26, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 25, 01:46pm until August 26, 07:00pm

    NOW until 7:00pm Wed

    Heat Advisory

  • This Afternoon

    High: 104 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 76. Southeast wind 5 to 10 mph becoming south southwest after midnight. Winds could gust as high as 20 mph.

    Low: 76 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 104. South southwest wind around 5 mph.

    High: 104 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 78. South southeast wind 5 to 10 mph.

    Low: 78 °F

    Mostly Clear

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 102. Southwest wind around 5 mph becoming north in the afternoon.

    High: 102 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 77. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 77 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Sunny and hot, with a high near 102. Calm wind becoming east northeast around 5 mph in the afternoon.

    High: 102 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. East wind around 5 mph becoming calm after midnight.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Sunny and hot, with a high near 104. South southeast wind around 5 mph.
Tonight
Mostly clear, with a low around 76. Southeast wind 5 to 10 mph becoming south southwest after midnight. Winds could gust as high as 20 mph.
Wednesday
Sunny and hot, with a high near 104. South southwest wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 78. South southeast wind 5 to 10 mph.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 102. Southwest wind around 5 mph becoming north in the afternoon.
Thursday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 77. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Friday
Sunny and hot, with a high near 102. Calm wind becoming east northeast around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 75. East wind around 5 mph becoming calm after midnight.
Saturday
Sunny and hot, with a high near 101. Calm wind becoming east southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 74.
Sunday
Sunny and hot, with a high near 100.
Sunday Night
Clear, with a low around 74.
Monday
Sunny and hot, with a high near 100.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles NNE Prairie Lea TX
 29.77°N 97.67°W (Elev. 404 ft)
Last Update:
1:24 pm CDT Aug 25, 2026
Forecast Valid:
1pm CDT Aug 25, 2026-6pm CDT Aug 31, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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