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

80°F

27°C

Humidity 64%
Wind Speed S 20 mph
Barometer 29.96 in (1013.7 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 3 Apr 11:56 am CDT
Extended Forecast for

4 Miles SSW San Marcos TX

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 88. South southeast wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 88 °F

    Mostly Cloudy

  • Tonight

    Tonight: A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 69. South southeast wind 15 to 20 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 40%.

    Low: 69 °F

    Chance
    Showers

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 79. South southeast wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 79 °F

    Showers

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 54. North northeast wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 54 °F

    Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers. Mostly cloudy, with a high near 66. North northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 66 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A 20 percent chance of showers. Cloudy, with a low around 52. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 52 °F

    Slight Chance
    Showers

  • Monday

    Monday: Mostly cloudy, with a high near 68. Northeast wind 5 to 10 mph.

    High: 68 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 49. Northeast wind around 5 mph becoming calm in the evening.

    Low: 49 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 71. North northeast wind 5 to 10 mph becoming east southeast in the afternoon.

    High: 71 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 88. South southeast wind 15 to 20 mph, with gusts as high as 30 mph.
Tonight
A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 69. South southeast wind 15 to 20 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 40%.
Saturday
Showers and possibly a thunderstorm. High near 79. South southeast wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 54. North northeast wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday
A 30 percent chance of showers. Mostly cloudy, with a high near 66. North northeast wind around 15 mph, with gusts as high as 25 mph.
Sunday Night
A 20 percent chance of showers. Cloudy, with a low around 52. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Mostly cloudy, with a high near 68. Northeast wind 5 to 10 mph.
Monday Night
Mostly cloudy, with a low around 49. Northeast wind around 5 mph becoming calm in the evening.
Tuesday
Mostly cloudy, with a high near 71. North northeast wind 5 to 10 mph becoming east southeast in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 53.
Wednesday
Mostly cloudy, with a high near 77.
Wednesday Night
Mostly cloudy, with a low around 60.
Thursday
A 20 percent chance of showers. Mostly cloudy, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW San Marcos TX
 29.83°N 97.94°W (Elev. 610 ft)
Last Update:
11:32 am CDT Apr 3, 2026
Forecast Valid:
12pm CDT Apr 3, 2026-6pm CDT Apr 9, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation