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.

Light Rain

77°F

25°C

Humidity 94%
Wind Speed SE 3 mph
Barometer 30.10 in (1018.6 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 11 Jul 12:56 pm CDT
Extended Forecast for

4 Miles WNW Niederwald TX

Flood Advisory until July 11, 04:45pm
Click here for hazard details and duration
Flood Advisory
  •  
    Flood Advisory until July 11, 04:45pm

    NOW until 4:45pm Sat

    Flood Advisory

  • This Afternoon

    High: 92 °F

    Showers
    Likely

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 75. South southeast wind around 5 mph.

    Low: 75 °F

    Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: A slight chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, then gradually becoming sunny, with a high near 92. Heat index values as high as 101. Calm wind becoming south southeast around 5 mph in the afternoon. Chance of precipitation is 30%.

    High: 92 °F

    Partly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 75. Southeast wind 5 to 10 mph becoming light south in the evening.

    Low: 75 °F

    Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 91. Calm wind becoming south southeast around 5 mph in the afternoon. Chance of precipitation is 60%.

    High: 91 °F

    Partly Sunny
    then Showers
    Likely

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74. East southeast wind around 5 mph becoming calm in the evening.

    Low: 74 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 88. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 70%.

    High: 88 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 73. Southeast wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Slight Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

This Afternoon
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 92. South southeast wind around 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 75. South southeast wind around 5 mph.
Sunday
A slight chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, then gradually becoming sunny, with a high near 92. Heat index values as high as 101. Calm wind becoming south southeast around 5 mph in the afternoon. Chance of precipitation is 30%.
Sunday Night
A 30 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 75. Southeast wind 5 to 10 mph becoming light south in the evening.
Monday
Showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 91. Calm wind becoming south southeast around 5 mph in the afternoon. Chance of precipitation is 60%.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74. East southeast wind around 5 mph becoming calm in the evening.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 88. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 70%.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 73. Southeast wind around 5 mph becoming calm in the evening.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 90. Calm wind becoming south southeast around 5 mph in the morning.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
Thursday Night
Partly cloudy, with a low around 75.
Friday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 92.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW Niederwald TX
 30.02°N 97.79°W (Elev. 646 ft)
Last Update:
1:07 pm CDT Jul 11, 2026
Forecast Valid:
1pm CDT Jul 11, 2026-6pm CDT Jul 17, 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