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

85°F

29°C

Humidity 48%
Wind Speed SE 18 mph
Barometer 29.89 in (1011.4 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 16 Apr 6:56 pm CDT
Extended Forecast for

5 Miles WSW Martindale TX

  • Tonight

    Tonight: Increasing clouds, with a low around 68. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Increasing
    Clouds

  • Friday

    Friday: Cloudy through mid morning, then gradual clearing, with a high near 90. South wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 90 °F

    Gradual
    Clearing

  • Friday Night

    Friday Night: Increasing clouds, with a low around 67. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 67 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. South wind 5 to 10 mph becoming north 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 60%.

    High: 77 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Cloudy, with a low around 54. North northeast wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.

    Low: 54 °F

    Showers
    Likely

  • Sunday

    Sunday: Partly sunny, with a high near 72. North northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 72 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 55. East northeast wind 5 to 10 mph.

    Low: 55 °F

    Mostly Cloudy

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 65. East northeast wind 5 to 10 mph.

    High: 65 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms. Cloudy, with a low around 58. East wind 5 to 10 mph.

    Low: 58 °F

    Chance
    Showers

Detailed Forecast

Tonight
Increasing clouds, with a low around 68. South wind 10 to 15 mph, with gusts as high as 20 mph.
Friday
Cloudy through mid morning, then gradual clearing, with a high near 90. South wind 10 to 20 mph, with gusts as high as 30 mph.
Friday Night
Increasing clouds, with a low around 67. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.
Saturday
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. South wind 5 to 10 mph becoming north 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 60%.
Saturday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Cloudy, with a low around 54. North northeast wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Sunday
Partly sunny, with a high near 72. North northeast wind around 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly cloudy, with a low around 55. East northeast wind 5 to 10 mph.
Monday
A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 65. East northeast wind 5 to 10 mph.
Monday Night
A 40 percent chance of showers and thunderstorms. Cloudy, with a low around 58. East wind 5 to 10 mph.
Tuesday
A 40 percent chance of showers and thunderstorms. Cloudy, with a high near 72.
Tuesday Night
Mostly cloudy, with a low around 64.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81.
Wednesday Night
Mostly cloudy, with a low around 66.
Thursday
Mostly cloudy, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW Martindale TX
 29.81°N 97.91°W (Elev. 581 ft)
Last Update:
6:44 pm CDT Apr 16, 2026
Forecast Valid:
7pm CDT Apr 16, 2026-6pm CDT Apr 23, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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