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

63°F

17°C

Humidity 100%
Wind Speed SW 7 mph
Barometer 29.97 in (1014.3 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 24 Mar 1:56 am CDT
Extended Forecast for

San Marcos TX

  • Overnight

    Overnight: Mostly cloudy, with a low around 59. North northeast wind around 5 mph.

    Low: 59 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 85. North northeast wind 5 to 10 mph.

    High: 85 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 61. East wind around 5 mph becoming calm in the evening.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 91. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 91 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 61. Southeast wind around 5 mph.

    Low: 61 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 85. South wind 5 to 10 mph becoming east southeast in the afternoon.

    High: 85 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms after 1am. Cloudy, with a low around 63. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 63 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 74. Southeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.

    High: 74 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 63. Southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.

    Low: 63 °F

    Showers

Detailed Forecast

Overnight
Mostly cloudy, with a low around 59. North northeast wind around 5 mph.
Monday
Mostly sunny, with a high near 85. North northeast wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 61. East wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 91. Calm wind becoming south southeast around 5 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 61. Southeast wind around 5 mph.
Wednesday
Mostly cloudy, with a high near 85. South wind 5 to 10 mph becoming east southeast in the afternoon.
Wednesday Night
A 30 percent chance of showers and thunderstorms after 1am. Cloudy, with a low around 63. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 74. Southeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
Thursday Night
Showers and possibly a thunderstorm. Low around 63. Southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 77. Chance of precipitation is 70%.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Saturday
Partly sunny, with a high near 84.
Saturday Night
Partly cloudy, with a low around 63.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
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Map Legend

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
2:42 am CDT Mar 24, 2025
Forecast Valid:
2am CDT Mar 24, 2025-6pm CDT Mar 30, 2025
 
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