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

Webinar on Heavy Rainfall and Flooding Threat for This Week - September 30, 2026

Watch our September 30, 2026, webinar regarding the heavy rainfall and flooding threat for South-Central Texas this week. A new webinar will be available around midday on Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

80°F

27°C

Humidity 90%
Wind Speed S 10 mph
Barometer 29.78 in (1007.4 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 1 Oct 4:56 am CDT
Extended Forecast for

Niederwald TX

Flood Watch October 1, 05:20am until October 2, 07:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch October 1, 05:20am until October 2, 07:00pm

    NOW until 7:00pm Fri

    Flood Watch

  • Overnight

    Low: 76 °F

    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 89. Heat index values as high as 100. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 89 °F

    Showers
    Likely then
    T-storms

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 71. South southeast wind around 5 mph becoming calm. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    Low: 71 °F

    T-storms

  • Friday

    Friday: Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. High near 81. North northeast wind around 5 mph. Chance of precipitation is 80%.

    High: 81 °F

    Showers

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. North wind 5 to 10 mph.

    Low: 68 °F

    Chance
    Showers

  • Saturday

    Saturday: A 40 percent chance of showers. Cloudy, with a high near 80. North wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 80 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 67. North wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 67 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80. North wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 80 °F

    Chance
    Showers

Detailed Forecast

Overnight
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 76. South wind around 10 mph, with gusts as high as 20 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 89. Heat index values as high as 100. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday Night
Showers and possibly a thunderstorm. Low around 71. South southeast wind around 5 mph becoming calm. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Friday
Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. High near 81. North northeast wind around 5 mph. Chance of precipitation is 80%.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. North wind 5 to 10 mph.
Saturday
A 40 percent chance of showers. Cloudy, with a high near 80. North wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 67. North wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80. North wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Sunday Night
Mostly cloudy, with a low around 67. North wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Partly sunny, with a high near 81.
Monday Night
Partly cloudy, with a low around 64.
Tuesday
Sunny, with a high near 82.
Tuesday Night
Mostly clear, with a low around 63.
Wednesday
Sunny, with a high near 84.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Niederwald TX
 30.02°N 97.73°W (Elev. 614 ft)
Last Update:
2:42 am CDT Oct 1, 2026
Forecast Valid:
5am CDT Oct 1, 2026-6pm CDT Oct 7, 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