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.

A Few Clouds

81°F

27°C

Humidity 79%
Wind Speed SE 16 mph
Barometer 29.89 in (1011.3 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 18 May 9:56 pm CDT
Extended Forecast for

Fentress TX

  • Tonight

    Tonight: Mostly cloudy, with a low around 79. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 79 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91. Heat index values as high as 100. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 91 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72. Southeast wind 5 to 15 mph becoming east northeast after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible.

    Low: 72 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 85. East southeast wind around 5 mph becoming northeast in the morning. Chance of precipitation is 60%.

    High: 85 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 73. East southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.

    Low: 73 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 82. Light south southeast wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 90%.

    High: 82 °F

    Showers then
    T-storms

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 71. South southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.

    Low: 71 °F

    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 84. Light south wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 70%.

    High: 84 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71. East southeast wind around 5 mph becoming calm in the evening.

    Low: 71 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Mostly cloudy, with a low around 79. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91. Heat index values as high as 100. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72. Southeast wind 5 to 15 mph becoming east northeast after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible.
Wednesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 85. East southeast wind around 5 mph becoming northeast in the morning. Chance of precipitation is 60%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 73. East southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.
Thursday
Showers and possibly a thunderstorm. High near 82. Light south southeast wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 90%.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 71. South southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.
Friday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 84. Light south wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 70%.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71. East southeast wind around 5 mph becoming calm in the evening.
Saturday
Showers and possibly a thunderstorm. High near 82. Chance of precipitation is 80%.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Chance of precipitation is 70%.
Sunday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Memorial Day
Showers and thunderstorms likely. Partly sunny, with a high near 84. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Fentress TX
 29.75°N 97.78°W (Elev. 436 ft)
Last Update:
6:42 pm CDT May 18, 2026
Forecast Valid:
10pm CDT May 18, 2026-6pm CDT May 25, 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