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.

Partly Cloudy

77°F

25°C

Humidity 90%
Wind Speed SE 5 mph
Barometer 30.08 in (1017.8 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 11 Jul 11:56 pm CDT
Extended Forecast for

2 Miles SSW Lockhart TX

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms after 4am. Mostly clear, with a low around 75. South wind around 5 mph becoming calm.

    Low: 75 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 92. Heat index values as high as 101. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 92 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 75. East southeast wind 5 to 10 mph becoming light and variable 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 92. Heat index values as high as 100. Calm wind becoming south southeast around 5 mph in the afternoon. Chance of precipitation is 60%.

    High: 92 °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. Southeast wind around 5 mph becoming calm in the evening.

    Low: 74 °F

    Chance
    Showers

  • 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 89. Calm wind becoming east southeast around 5 mph in the afternoon. Chance of precipitation is 70%.

    High: 89 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 73. East southeast wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 87. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 87 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. East southeast wind around 5 mph.

    Low: 72 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms after 4am. Mostly clear, with a low around 75. South wind around 5 mph becoming calm.
Sunday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 92. Heat index values as high as 101. Calm wind becoming southeast around 5 mph in the afternoon.
Sunday Night
A 30 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 75. East southeast wind 5 to 10 mph becoming light and variable in the evening.
Monday
Showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 92. Heat index values as high as 100. 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. Southeast wind around 5 mph becoming calm in the evening.
Tuesday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 89. Calm wind becoming east southeast around 5 mph in the afternoon. Chance of precipitation is 70%.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 73. East 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 87. Calm wind becoming southeast around 5 mph in the afternoon.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. East southeast wind around 5 mph.
Thursday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 91. Chance of precipitation is 20%.
Thursday Night
Partly cloudy, with a low around 71.
Friday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 93.
Friday Night
Partly cloudy, with a low around 73.
Saturday
Mostly sunny, with a high near 94.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSW Lockhart TX
 29.86°N 97.7°W (Elev. 545 ft)
Last Update:
12:46 am CDT Jul 12, 2026
Forecast Valid:
12am CDT Jul 12, 2026-6pm CDT Jul 18, 2026
 
Forecast Discussion
 
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Additional Resources

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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