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.

Overcast

71°F

22°C

Humidity 96%
Wind Speed Calm
Barometer 30.01 in (1015.7 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 21 May 8:56 am CDT
Extended Forecast for

2 Miles WSW San Marcos TX

  • Today

    Today: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. Northeast wind around 5 mph becoming south in the afternoon. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 82 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 68. South southeast wind around 5 mph becoming calm in the evening.

    Low: 68 °F

    Chance
    T-storms

  • Friday

    Friday: Mostly sunny, with a high near 87. Calm wind becoming south around 5 mph in the afternoon.

    High: 87 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms. Increasing clouds, with a low around 71. South southeast wind around 5 mph.

    Low: 71 °F

    Chance
    T-storms

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 83. South wind around 5 mph. Chance of precipitation is 90%.

    High: 83 °F

    Showers
    Likely then
    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 68. East southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.

    Low: 68 °F

    Heavy Rain

  • Sunday

    Sunday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 83. East northeast wind around 5 mph. Chance of precipitation is 70%.

    High: 83 °F

    Chance
    T-storms then
    Showers
    Likely

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 68. Northeast wind around 5 mph becoming calm in the evening.

    Low: 68 °F

    Chance
    T-storms

  • Memorial Day

    Memorial Day: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. Calm wind becoming east around 5 mph in the afternoon.

    High: 84 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. Northeast wind around 5 mph becoming south in the afternoon. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 68. South southeast wind around 5 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 87. Calm wind becoming south around 5 mph in the afternoon.
Friday Night
A 40 percent chance of showers and thunderstorms. Increasing clouds, with a low around 71. South southeast wind around 5 mph.
Saturday
Showers and possibly a thunderstorm. High near 83. South wind around 5 mph. Chance of precipitation is 90%.
Saturday Night
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 68. East southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.
Sunday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 83. East 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 68. Northeast wind around 5 mph becoming calm in the evening.
Memorial Day
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. Calm wind becoming east around 5 mph in the afternoon.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Tuesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Wednesday
Showers and thunderstorms likely. Mostly cloudy, with a high near 84. Chance of precipitation is 70%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW San Marcos TX
 29.86°N 97.97°W (Elev. 646 ft)
Last Update:
7:46 am CDT May 21, 2026
Forecast Valid:
9am CDT May 21, 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