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

16°C

60°F

Humidity 31%
Wind Speed N 7 km/h
Barometer 1032.0 mb (30.48 in)
Dewpoint -2°C (29°F)
Visibility 16 km
Last update 12 Jan 11:56 am CST
Extended Forecast for

2 Miles E San Marcos TX

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 17. Calm wind.

    High: 17 °C

    Partly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers, mainly after 3am. Mostly cloudy, with a low around 7. Calm wind.

    Low: 7 °C

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: A 20 percent chance of showers before noon. Mostly cloudy, with a high near 16. Southwest wind 5 to 10 km/h.

    High: 16 °C

    Slight Chance
    Showers then
    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 6. Southwest wind around 10 km/h.

    Low: 6 °C

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 21. West wind 10 to 15 km/h becoming north 20 to 25 km/h in the morning. Winds could gust as high as 45 km/h.

    High: 21 °C

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 3. North wind 10 to 20 km/h, with gusts as high as 35 km/h.

    Low: 3 °C

    Clear

  • Thursday

    Thursday: Sunny, with a high near 17. North northwest wind around 10 km/h becoming east southeast in the afternoon.

    High: 17 °C

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 4. South southeast wind around 10 km/h becoming southwest after midnight.

    Low: 4 °C

    Clear

  • Friday

    Friday: Sunny, with a high near 21. Southwest wind 10 to 15 km/h becoming north in the afternoon.

    High: 21 °C

    Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 17. Calm wind.
Tonight
A 30 percent chance of showers, mainly after 3am. Mostly cloudy, with a low around 7. Calm wind.
Tuesday
A 20 percent chance of showers before noon. Mostly cloudy, with a high near 16. Southwest wind 5 to 10 km/h.
Tuesday Night
Mostly clear, with a low around 6. Southwest wind around 10 km/h.
Wednesday
Sunny, with a high near 21. West wind 10 to 15 km/h becoming north 20 to 25 km/h in the morning. Winds could gust as high as 45 km/h.
Wednesday Night
Clear, with a low around 3. North wind 10 to 20 km/h, with gusts as high as 35 km/h.
Thursday
Sunny, with a high near 17. North northwest wind around 10 km/h becoming east southeast in the afternoon.
Thursday Night
Clear, with a low around 4. South southeast wind around 10 km/h becoming southwest after midnight.
Friday
Sunny, with a high near 21. Southwest wind 10 to 15 km/h becoming north in the afternoon.
Friday Night
Mostly clear, with a low around 4.
Saturday
Sunny, with a high near 18.
Saturday Night
Mostly clear, with a low around 3.
Sunday
Sunny, with a high near 18.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles E San Marcos TX
 29.88°N 97.91°W (Elev. 597 m)
Last Update:
12:04 pm CST Jan 12, 2026
Forecast Valid:
12pm CST Jan 12, 2026-6pm CST Jan 18, 2026
 
Forecast Discussion
 
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Additional Resources

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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