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

81°F

27°C

Humidity 85%
Wind Speed SE 10 mph
Barometer 30.01 in (1015.4 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 21 Jun 9:56 pm CDT
Extended Forecast for

5 Miles SW San Marcos TX

  • Tonight

    Tonight: Partly cloudy, with a low around 75. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 93. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 93 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 73. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 73 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 93. Heat index values as high as 100. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 93 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 71. Southeast wind 10 to 15 mph becoming light south southeast after midnight. Winds could gust as high as 20 mph.

    Low: 71 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 93. Light east southeast wind becoming southeast 5 to 10 mph in the morning.

    High: 93 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 71. Southeast wind 5 to 10 mph becoming light south southeast after midnight.

    Low: 71 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92. Light east southeast wind becoming southeast 5 to 10 mph in the morning.

    High: 92 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 72. South southeast wind 5 to 10 mph.

    Low: 72 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 75. South southeast wind around 10 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 93. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Partly cloudy, with a low around 73. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Monday
Mostly sunny, with a high near 93. Heat index values as high as 100. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 71. Southeast wind 10 to 15 mph becoming light south southeast after midnight. Winds could gust as high as 20 mph.
Tuesday
Mostly sunny, with a high near 93. Light east southeast wind becoming southeast 5 to 10 mph in the morning.
Tuesday Night
Mostly clear, with a low around 71. Southeast wind 5 to 10 mph becoming light south southeast after midnight.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92. Light east southeast wind becoming southeast 5 to 10 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 72. South southeast wind 5 to 10 mph.
Thursday
Mostly sunny, with a high near 93.
Thursday Night
Partly cloudy, with a low around 72.
Friday
Mostly sunny, with a high near 92.
Friday Night
Partly cloudy, with a low around 72.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SW San Marcos TX
 29.83°N 97.99°W (Elev. 676 ft)
Last Update:
7:42 pm CDT Jun 21, 2025
Forecast Valid:
10pm CDT Jun 21, 2025-6pm CDT Jun 28, 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