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

75°F

24°C

Humidity 88%
Wind Speed SE 7 mph
Barometer 30.00 in (1014.8 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 15 Oct 1:56 am CDT
Extended Forecast for

5 Miles WNW San Marcos TX

  • Overnight

    Overnight: A 20 percent chance of showers before 4am. Mostly cloudy, with a low around 70. South southeast wind around 5 mph.

    Low: 70 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 90. South southeast wind 5 to 10 mph.

    High: 90 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of showers, mainly after 4am. Increasing clouds, with a low around 63. Light and variable wind becoming north 10 to 15 mph after midnight. Winds could gust as high as 20 mph. New precipitation amounts of less than a tenth of an inch possible.

    Low: 63 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: A 30 percent chance of showers before 7am. Partly sunny, with a high near 70. Breezy, with a north wind 20 to 25 mph, with gusts as high as 40 mph.

    High: 70 °F

    Chance
    Showers then
    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 48. North wind 15 to 20 mph, with gusts as high as 40 mph.

    Low: 48 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 68. North northeast wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 68 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 46. North northeast wind around 5 mph.

    Low: 46 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 72. North wind around 5 mph becoming east in the afternoon.

    High: 72 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 50. Calm wind.

    Low: 50 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers before 4am. Mostly cloudy, with a low around 70. South southeast wind around 5 mph.
Thursday
Partly sunny, with a high near 90. South southeast wind 5 to 10 mph.
Thursday Night
A 50 percent chance of showers, mainly after 4am. Increasing clouds, with a low around 63. Light and variable wind becoming north 10 to 15 mph after midnight. Winds could gust as high as 20 mph. New precipitation amounts of less than a tenth of an inch possible.
Friday
A 30 percent chance of showers before 7am. Partly sunny, with a high near 70. Breezy, with a north wind 20 to 25 mph, with gusts as high as 40 mph.
Friday Night
Mostly clear, with a low around 48. North wind 15 to 20 mph, with gusts as high as 40 mph.
Saturday
Sunny, with a high near 68. North northeast wind 10 to 15 mph, with gusts as high as 30 mph.
Saturday Night
Mostly clear, with a low around 46. North northeast wind around 5 mph.
Sunday
Sunny, with a high near 72. North wind around 5 mph becoming east in the afternoon.
Sunday Night
Mostly clear, with a low around 50. Calm wind.
Monday
Mostly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 55.
Tuesday
Mostly sunny, with a high near 81.
Tuesday Night
Partly cloudy, with a low around 59.
Wednesday
Mostly sunny, with a high near 85.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WNW San Marcos TX
 29.9°N 97.99°W (Elev. 850 ft)
Last Update:
1:24 am CDT Oct 15, 2026
Forecast Valid:
2am CDT Oct 15, 2026-6pm CDT Oct 21, 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