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.

Fair

88°F

31°C

Humidity 46%
Wind Speed Vrbl 5 mph
Barometer 30.09 in (1018.1 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 13 May 1:56 pm CDT
Extended Forecast for

San Marcos TX

  • This Afternoon

    This Afternoon: Sunny, with a high near 89. Calm wind becoming east southeast around 5 mph.

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 65. Southeast wind around 5 mph becoming calm in the evening.

    Low: 65 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 90. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 90 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 67. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 67 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 91. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 91 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 70. South southeast wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 70 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 89. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 89 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 75. South southeast wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 75 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 87. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 87 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Sunny, with a high near 89. Calm wind becoming east southeast around 5 mph.
Tonight
Mostly clear, with a low around 65. Southeast wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 90. South wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Partly cloudy, with a low around 67. South wind around 10 mph, with gusts as high as 20 mph.
Friday
Partly sunny, with a high near 91. South wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
Mostly cloudy, with a low around 70. South southeast wind 10 to 15 mph, with gusts as high as 30 mph.
Saturday
Partly sunny, with a high near 89. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday Night
Mostly cloudy, with a low around 75. South southeast wind 10 to 15 mph, with gusts as high as 30 mph.
Sunday
Mostly cloudy, with a high near 87. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.
Sunday Night
Mostly cloudy, with a low around 78.
Monday
A 40 percent chance of showers and thunderstorms. Cloudy, with a high near 86.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 76.
Tuesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, 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:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
1:28 pm CDT May 13, 2026
Forecast Valid:
2pm CDT May 13, 2026-6pm CDT May 19, 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