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

86°F

30°C

Humidity 23%
Wind Speed NE 5 mph
Barometer 29.94 in (1013.3 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 21 Apr 6:56 pm CDT
Extended Forecast for

4 Miles NNW San Marcos Municipal Airport TX

  • Tonight

    Tonight: Increasing clouds, with a low around 64. East wind around 5 mph becoming calm after midnight.

    Low: 64 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 87. Light southeast wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 87 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms. Increasing clouds, with a low around 67. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 67 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. Southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 82 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 67 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly after 1pm. Mostly cloudy, with a high near 83. South southeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 83 °F

    Chance
    T-storms then
    T-storms
    Likely

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 67. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 67 °F

    Chance
    T-storms

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 87 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 66. Southeast wind 5 to 10 mph.

    Low: 66 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 64. East wind around 5 mph becoming calm after midnight.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 87. Light southeast wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Increasing clouds, with a low around 67. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. Southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Showers and thunderstorms likely, mainly after 1pm. Mostly cloudy, with a high near 83. South southeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 67. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Mostly cloudy, with a low around 66. Southeast wind 5 to 10 mph.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87.
Saturday Night
Mostly cloudy, with a low around 67.
Sunday
Partly sunny, with a high near 89.
Sunday Night
Mostly cloudy, with a low around 69.
Monday
Mostly cloudy, with a high near 90.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
Last Update:
3:52 pm CDT Apr 21, 2025
Forecast Valid:
7pm CDT Apr 21, 2025-6pm CDT Apr 28, 2025
 
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