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

100°F

38°C

Humidity 30%
Wind Speed S 10 G 17 mph
Barometer 29.98 in (1014.2 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index102°F (39°C)
Last update 24 Aug 2:56 pm CDT
Extended Forecast for

Fentress TX

Heat Advisory August 24, 03:35pm until August 26, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 24, 03:35pm 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 75. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Mostly Clear

  • Tuesday

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

    High: 103 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 77. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 77 °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: Partly cloudy, with a low around 78. South wind around 5 mph.

    Low: 78 °F

    Partly Cloudy

  • Thursday

    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.

    High: 102 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 78. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 78 °F

    Slight Chance
    T-storms

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 75. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Tuesday
Sunny and hot, with a high near 103. Southwest wind around 5 mph.
Tuesday Night
Mostly clear, with a low around 77. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Sunny and hot, with a high near 103. South southwest wind around 5 mph.
Wednesday Night
Partly cloudy, with a low around 78. South 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.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 78. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 100. Calm wind becoming east around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 77.
Saturday
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:
Fentress TX
 29.75°N 97.78°W (Elev. 436 ft)
Last Update:
2:44 pm CDT Aug 24, 2026
Forecast Valid:
3pm CDT Aug 24, 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