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.

Mostly Cloudy

73°F

23°C

Humidity 94%
Wind Speed E 5 mph
Barometer 30.00 in (1015.4 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 20 May 9:56 pm CDT
Extended Forecast for

5 Miles SSE Wimberley TX

  • Tonight

    Tonight: A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. East wind around 5 mph becoming south after midnight. Chance of precipitation is 40%.

    Low: 68 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 10am, then a chance of showers and thunderstorms after 10am. Mostly cloudy, with a high near 79. East wind around 5 mph becoming southwest in the morning. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 79 °F

    Showers
    Likely then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 67. South southeast wind around 5 mph.

    Low: 67 °F

    Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. South wind around 5 mph.

    High: 85 °F

    Partly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. South wind around 5 mph.

    Low: 69 °F

    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 82. South wind around 5 mph. Chance of precipitation is 80%.

    High: 82 °F

    Chance
    T-storms then
    T-storms

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 67. East southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.

    Low: 67 °F

    Showers

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 82. Northeast wind around 5 mph. Chance of precipitation is 70%.

    High: 82 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 66. Northeast wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. East wind around 5 mph becoming south after midnight. Chance of precipitation is 40%.
Thursday
A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 10am, then a chance of showers and thunderstorms after 10am. Mostly cloudy, with a high near 79. East wind around 5 mph becoming southwest in the morning. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
A 40 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 67. South southeast wind around 5 mph.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. South wind around 5 mph.
Friday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. South wind around 5 mph.
Saturday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 82. South wind around 5 mph. Chance of precipitation is 80%.
Saturday Night
Showers and possibly a thunderstorm. Low around 67. East southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.
Sunday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 82. Northeast wind around 5 mph. Chance of precipitation is 70%.
Sunday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 66. Northeast wind around 5 mph becoming calm in the evening.
Memorial Day
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 84.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Tuesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Wednesday
Showers and thunderstorms likely. Mostly cloudy, with a high near 83. Chance of precipitation is 70%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSE Wimberley TX
 29.92°N 98.07°W (Elev. 1047 ft)
Last Update:
7:42 pm CDT May 20, 2026
Forecast Valid:
9pm CDT May 20, 2026-6pm CDT May 27, 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