National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

70°F

21°C

Humidity 84%
Wind Speed Calm
Barometer 29.92 in (1012.2 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 3 Aug 6:56 am CDT
Extended Forecast for

4 Miles NNE Prairie Lea TX

  • Today

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

    High: 102 °F

    Hot

  • Tonight

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

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, then gradually becoming sunny and hot, with a high near 100. Heat index values as high as 104. South wind 5 to 10 mph.

    High: 100 °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 99. South wind 5 to 10 mph.

    High: 99 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 76. South wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny and hot, with a high near 99. South wind around 5 mph.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 77. South wind 5 to 10 mph.

    Low: 77 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 98. Calm wind becoming south southeast around 5 mph in the morning.

    High: 98 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Sunny and hot, with a high near 102. Calm wind becoming south southeast around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 75. South wind 5 to 10 mph.
Tuesday
Partly sunny, then gradually becoming sunny and hot, with a high near 100. Heat index values as high as 104. South wind 5 to 10 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 99. South wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 76. South wind 5 to 15 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny and hot, with a high near 99. South wind around 5 mph.
Thursday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 77. South wind 5 to 10 mph.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 98. Calm wind becoming south southeast around 5 mph in the morning.
Friday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 76.
Saturday
Mostly sunny, with a high near 97.
Saturday Night
Mostly clear, with a low around 76.
Sunday
Mostly sunny, with a high near 97.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNE Prairie Lea TX
 29.77°N 97.7°W (Elev. 449 ft)
Last Update:
6:42 am CDT Aug 3, 2026
Forecast Valid:
7am CDT Aug 3, 2026-6pm CDT Aug 9, 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