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.

A Few Clouds

96°F

36°C

Humidity 41%
Wind Speed S 10 mph
Barometer 30.04 in (1016.5 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index101°F (38°C)
Last update 12 Jul 3:56 pm CDT
Extended Forecast for

2 Miles WSW San Marcos TX

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93. Heat index values as high as 101. South southeast wind around 10 mph.

    High: 93 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 76. South southeast wind 5 to 10 mph becoming light south after midnight.

    Low: 76 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 91. Calm wind becoming south around 5 mph in the afternoon.

    High: 91 °F

    Partly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: Showers and thunderstorms likely before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 74. East southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 74 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 86. Calm wind becoming south southeast around 5 mph in the afternoon. Chance of precipitation is 60%.

    High: 86 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.

    Low: 72 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely before 10am, then showers likely and possibly a thunderstorm between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 86. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 70%.

    High: 86 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72. East wind around 5 mph becoming calm in the evening.

    Low: 72 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 87. Light east wind becoming southeast 5 to 10 mph in the morning. Chance of precipitation is 30%.

    High: 87 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93. Heat index values as high as 101. South southeast wind around 10 mph.
Tonight
A 30 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 76. South southeast wind 5 to 10 mph becoming light south after midnight.
Monday
A 40 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 91. Calm wind becoming south around 5 mph in the afternoon.
Monday Night
Showers and thunderstorms likely before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 74. East southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Tuesday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 86. Calm wind becoming south southeast around 5 mph in the afternoon. Chance of precipitation is 60%.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.
Wednesday
Showers likely before 10am, then showers likely and possibly a thunderstorm between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 86. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 70%.
Wednesday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72. East wind around 5 mph becoming calm in the evening.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 87. Light east wind becoming southeast 5 to 10 mph in the morning. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 73.
Friday
Partly sunny, with a high near 90.
Friday Night
Partly cloudy, with a low around 74.
Saturday
Mostly sunny, with a high near 91.
Saturday Night
Partly cloudy, with a low around 74.
Sunday
Mostly sunny, with a high near 93.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW San Marcos TX
 29.86°N 97.97°W (Elev. 646 ft)
Last Update:
2:46 pm CDT Jul 12, 2026
Forecast Valid:
4pm CDT Jul 12, 2026-6pm CDT Jul 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