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

75°F

24°C

Humidity 88%
Wind Speed S 6 mph
Barometer 30.10 in (1018.4 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 1 Aug 5:56 am CDT
Extended Forecast for

Martindale TX

  • Today

    Today: A 30 percent chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 100. Heat index values as high as 106. Southwest wind around 5 mph becoming east in the afternoon.

    High: 100 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 10pm. Partly cloudy, with a low around 76. East wind around 5 mph becoming calm after midnight.

    Low: 76 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 98. Heat index values as high as 106. Calm wind becoming west around 5 mph.

    High: 98 °F

    Mostly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 76. East wind around 5 mph becoming calm in the evening.

    Low: 76 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 98. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 98 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of thunderstorms before 7pm. Mostly clear, with a low around 76. South wind around 5 mph. Chance of precipitation is 10%.

    Low: 76 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 98. South wind around 5 mph becoming east southeast in the afternoon.

    High: 98 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 77. East wind 5 to 10 mph becoming south after midnight.

    Low: 77 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 95. South wind around 5 mph becoming east southeast in the afternoon.

    High: 95 °F

    Mostly Sunny

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 100. Heat index values as high as 106. Southwest wind around 5 mph becoming east in the afternoon.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 10pm. Partly cloudy, with a low around 76. East wind around 5 mph becoming calm after midnight.
Saturday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 98. Heat index values as high as 106. Calm wind becoming west around 5 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 76. East wind around 5 mph becoming calm in the evening.
Sunday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 98. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 20%.
Sunday Night
A slight chance of thunderstorms before 7pm. Mostly clear, with a low around 76. South wind around 5 mph. Chance of precipitation is 10%.
Monday
Mostly sunny, with a high near 98. South wind around 5 mph becoming east southeast in the afternoon.
Monday Night
Partly cloudy, with a low around 77. East wind 5 to 10 mph becoming south after midnight.
Tuesday
Mostly sunny, with a high near 95. South wind around 5 mph becoming east southeast in the afternoon.
Tuesday Night
Mostly clear, with a low around 74.
Wednesday
Sunny, with a high near 97.
Wednesday Night
Mostly clear, with a low around 74.
Thursday
Sunny, with a high near 98.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Martindale TX
 29.84°N 97.83°W (Elev. 502 ft)
Last Update:
5:32 am CDT Aug 1, 2025
Forecast Valid:
6am CDT Aug 1, 2025-6pm CDT Aug 7, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation