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

65°F

18°C

Humidity 73%
Wind Speed N 10 mph
Barometer 30.16 in (1021.1 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 7 Nov 10:56 am CST
Extended Forecast for

3 Miles SSW Manchaca TX

  • Today

    Today: A 20 percent chance of rain after 3pm. Mostly cloudy, with a high near 72. North northeast wind 5 to 10 mph.

    High: 72 °F

    Slight Chance
    Rain

  • Tonight

    Tonight: A chance of rain and thunderstorms, then rain likely after midnight. Mostly cloudy, with a low around 55. North northeast wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 55 °F

    Rain Likely

  • Sunday

    Sunday: Rain. High near 65. Northeast wind 5 to 10 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 65 °F

    Rain

  • Sunday Night

    Sunday Night: Rain likely, mainly before midnight. Mostly cloudy, with a low around 53. North northeast wind around 5 mph becoming calm. Chance of precipitation is 60%.

    Low: 53 °F

    Rain Likely

  • Monday

    Monday: Showers likely. Mostly cloudy, with a high near 66. North northeast wind around 5 mph becoming calm. Chance of precipitation is 70%.

    High: 66 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 52. Calm wind.

    Low: 52 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers before noon. Mostly cloudy, with a high near 70. Calm wind.

    High: 70 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 54. Calm wind.

    Low: 54 °F

    Mostly Cloudy

  • Veterans Day

    Veterans Day: A 20 percent chance of showers. Mostly cloudy, with a high near 75. Calm wind.

    High: 75 °F

    Slight Chance
    Showers

Detailed Forecast

Today
A 20 percent chance of rain after 3pm. Mostly cloudy, with a high near 72. North northeast wind 5 to 10 mph.
Tonight
A chance of rain and thunderstorms, then rain likely after midnight. Mostly cloudy, with a low around 55. North northeast wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
Rain. High near 65. Northeast wind 5 to 10 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 53. North northeast wind around 5 mph becoming calm. Chance of precipitation is 60%.
Monday
Showers likely. Mostly cloudy, with a high near 66. North northeast wind around 5 mph becoming calm. Chance of precipitation is 70%.
Monday Night
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 52. Calm wind.
Tuesday
A 20 percent chance of showers before noon. Mostly cloudy, with a high near 70. Calm wind.
Tuesday Night
Mostly cloudy, with a low around 54. Calm wind.
Veterans Day
A 20 percent chance of showers. Mostly cloudy, with a high near 75. Calm wind.
Wednesday Night
Mostly cloudy, with a low around 54.
Thursday
Mostly sunny, with a high near 74.
Thursday Night
Mostly clear, with a low around 48.
Friday
Sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Manchaca TX
 30.09°N 97.92°W (Elev. 804 ft)
Last Update:
10:32 am CST Nov 7, 2026
Forecast Valid:
11am CST Nov 7, 2026-6pm CST Nov 13, 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