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

63°F

17°C

Humidity 93%
Wind Speed N 6 mph
Barometer 30.15 in (1020.6 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 10 Feb 11:56 pm CST
Extended Forecast for

San Marcos TX

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 56. Calm wind becoming north around 5 mph.

    Low: 56 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 75. North wind 5 to 10 mph.

    High: 75 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 52. Northeast wind around 5 mph becoming calm in the evening.

    Low: 52 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 80. Calm wind becoming south around 5 mph in the afternoon.

    High: 80 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 59. South wind around 5 mph becoming calm after midnight.

    Low: 59 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 82. Light south wind becoming south southeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 82 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Showers likely after midnight. Mostly cloudy, with a low around 62. South southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

    Low: 62 °F

    Mostly Cloudy
    then Showers
    Likely

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 81. South wind 10 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%.

    High: 81 °F

    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 53. West northwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 53 °F

    Slight Chance
    Showers then
    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 56. Calm wind becoming north around 5 mph.
Wednesday
Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 75. North wind 5 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 52. Northeast wind around 5 mph becoming calm in the evening.
Thursday
Partly sunny, with a high near 80. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 59. South wind around 5 mph becoming calm after midnight.
Friday
Mostly cloudy, with a high near 82. Light south wind becoming south southeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
Showers likely after midnight. Mostly cloudy, with a low around 62. South southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Saturday
Showers and possibly a thunderstorm. High near 81. South wind 10 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%.
Saturday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 53. West northwest wind around 10 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 75.
Sunday Night
Clear, with a low around 46.
Washington's Birthday
Sunny, with a high near 78.
Monday Night
Partly cloudy, with a low around 52.
Tuesday
Partly sunny, with a high near 82.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.91°W (Elev. 597 ft)
Last Update:
11:44 pm CST Feb 10, 2026
Forecast Valid:
12am CST Feb 11, 2026-6pm CST Feb 17, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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