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.

Mostly Cloudy

83°F

28°C

Humidity 79%
Wind Speed SW 9 mph
Barometer 30.04 in (1016.4 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 10 Sep 8:56 am CDT
Extended Forecast for

4 Miles WNW Niederwald TX

  • Today

    Today: Mostly sunny, with a high near 96. Heat index values as high as 103. South southeast wind around 5 mph.

    High: 96 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 75. South southeast wind 5 to 10 mph.

    Low: 75 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 98. Heat index values as high as 105. South wind 5 to 10 mph.

    High: 98 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 76. South wind 5 to 10 mph.

    Low: 76 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 99. South wind 5 to 10 mph.

    High: 99 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 75. South wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 98. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 98 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 75. Southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny and hot, with a high near 99. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 99 °F

    Hot

Detailed Forecast

Today
Mostly sunny, with a high near 96. Heat index values as high as 103. South southeast wind around 5 mph.
Tonight
Partly cloudy, with a low around 75. South southeast wind 5 to 10 mph.
Friday
Mostly sunny, with a high near 98. Heat index values as high as 105. South wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 76. South wind 5 to 10 mph.
Saturday
Mostly sunny and hot, with a high near 99. South wind 5 to 10 mph.
Saturday Night
Mostly clear, with a low around 75. South wind 5 to 15 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 98. South wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 75. Southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Monday
Mostly sunny and hot, with a high near 99. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Mostly sunny, with a high near 98.
Tuesday Night
Mostly clear, with a low around 74.
Wednesday
Mostly sunny, with a high near 97.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW Niederwald TX
 30.02°N 97.79°W (Elev. 646 ft)
Last Update:
6:42 am CDT Sep 10, 2026
Forecast Valid:
9am CDT Sep 10, 2026-6pm CDT Sep 16, 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