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

82°F

28°C

Humidity 69%
Wind Speed S 6 mph
Barometer 29.98 in (1014.4 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 8 Sep 12:56 am CDT
Extended Forecast for

Martindale TX

  • Overnight

    Overnight: Mostly clear, with a low around 77. South wind around 5 mph becoming calm.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 100. Heat index values as high as 107. Calm wind becoming south around 5 mph in the afternoon.

    High: 100 °F

    Hot

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 76. Southeast wind 5 to 10 mph becoming light south after midnight.

    Low: 76 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 98. Heat index values as high as 105. Calm wind becoming south southeast around 5 mph.

    High: 98 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 76. Southeast wind around 5 mph becoming calm in the evening.

    Low: 76 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 98. Calm wind.

    High: 98 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 75. East wind around 5 mph becoming south southwest after midnight.

    Low: 75 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 98. Calm wind becoming south around 5 mph in the morning.

    High: 98 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 76. South southeast wind 5 to 10 mph.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 77. South wind around 5 mph becoming calm.
Tuesday
Sunny and hot, with a high near 100. Heat index values as high as 107. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 76. Southeast wind 5 to 10 mph becoming light south after midnight.
Wednesday
Mostly sunny, with a high near 98. Heat index values as high as 105. Calm wind becoming south southeast around 5 mph.
Wednesday Night
Partly cloudy, with a low around 76. Southeast wind around 5 mph becoming calm in the evening.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 98. Calm wind.
Thursday Night
Partly cloudy, with a low around 75. East wind around 5 mph becoming south southwest after midnight.
Friday
Mostly sunny, with a high near 98. Calm wind becoming south around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 76. South southeast wind 5 to 10 mph.
Saturday
Sunny and hot, with a high near 99.
Saturday Night
Mostly clear, with a low around 75.
Sunday
Mostly sunny, with a high near 98.
Sunday Night
Partly cloudy, with a low around 75.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 97.
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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:
12:42 am CDT Sep 8, 2026
Forecast Valid:
1am CDT Sep 8, 2026-6pm CDT Sep 14, 2026
 
Forecast Discussion
 
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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