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

78°F

26°C

Humidity 82%
Wind Speed SW 5 mph
Barometer 29.98 in (1014.1 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 2 Sep 3:56 am CDT
Extended Forecast for

Niederwald TX

  • Today

    Today: Mostly sunny and hot, with a high near 100. Heat index values as high as 105. Southwest wind around 5 mph.

    High: 100 °F

    Hot

  • Tonight

    Tonight: Partly cloudy, with a low around 76. East southeast wind 5 to 10 mph becoming south after midnight.

    Low: 76 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 98. Heat index values as high as 104. South southwest wind 5 to 10 mph becoming southeast in the afternoon.

    High: 98 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 76 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A slight chance of showers and thunderstorms before 7am, then a slight chance of showers between 7am and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 97. South wind around 5 mph. Chance of precipitation is 20%.

    High: 97 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of thunderstorms before 7pm. Mostly clear, with a low around 74. Southeast wind 5 to 10 mph. Chance of precipitation is 10%.

    Low: 74 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 98. Calm wind becoming south around 5 mph.

    High: 98 °F

    Sunny

  • Saturday Night

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

    Low: 75 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 97. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 97 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

Today
Mostly sunny and hot, with a high near 100. Heat index values as high as 105. Southwest wind around 5 mph.
Tonight
Partly cloudy, with a low around 76. East southeast wind 5 to 10 mph becoming south after midnight.
Thursday
A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 98. Heat index values as high as 104. South southwest wind 5 to 10 mph becoming southeast in the afternoon.
Thursday Night
A slight chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Friday
A slight chance of showers and thunderstorms before 7am, then a slight chance of showers between 7am and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 97. South wind around 5 mph. Chance of precipitation is 20%.
Friday Night
A slight chance of thunderstorms before 7pm. Mostly clear, with a low around 74. Southeast wind 5 to 10 mph. Chance of precipitation is 10%.
Saturday
Sunny, with a high near 98. Calm wind becoming south around 5 mph.
Saturday Night
Mostly clear, with a low around 75. East southeast wind around 5 mph becoming calm after midnight.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 97. Calm wind becoming east southeast around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 75.
Labor Day
Sunny, with a high near 97.
Monday Night
Mostly clear, with a low around 74.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 98.
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ABOUT THIS FORECAST

 
Point Forecast:
Niederwald TX
 30°N 97.73°W (Elev. 548 ft)
Last Update:
2:46 am CDT Sep 2, 2026
Forecast Valid:
4am CDT Sep 2, 2026-6pm CDT Sep 8, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation