National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Areas of Excessive Rainfall and Severe Thunderstorms Friday

Heavy thunderstorms may bring areas of excessive rainfall and locally considerable flooding over parts of the Ozarks into the lower-Mississippi River Valley Friday and Saturday. Scattered severe thunderstorms may occur Friday from Montana into the central Plains, with hail and corridors of damaging winds possible. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

68°F

20°C

Humidity 100%
Wind Speed Calm
Barometer 29.93 in (1013.0 mb)
Dewpoint 68°F (20°C)
Visibility 9.00 mi
Last update 13 Jun 12:56 am CDT
Extended Forecast for

San Marcos TX

  • Overnight

    Overnight: Mostly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers and thunderstorms between 1pm and 4pm. Patchy fog before 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 92. Heat index values as high as 106. South wind 5 to 10 mph. Chance of precipitation is 30%.

    High: 92 °F

    Patchy Fog
    then Chance
    T-storms

  • Friday Night

    Friday Night: Increasing clouds, with a low around 75. South southeast wind 5 to 10 mph.

    Low: 75 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 93. Heat index values as high as 106. South wind 5 to 10 mph.

    High: 93 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 74. South wind 5 to 10 mph.

    Low: 74 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. South wind 5 to 10 mph.

    High: 93 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 75. South southeast wind 5 to 10 mph.

    Low: 75 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 93. South wind 5 to 10 mph.

    High: 93 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 75. South wind 5 to 10 mph.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 70. Calm wind.
Friday
A chance of showers and thunderstorms between 1pm and 4pm. Patchy fog before 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 92. Heat index values as high as 106. South wind 5 to 10 mph. Chance of precipitation is 30%.
Friday Night
Increasing clouds, with a low around 75. South southeast wind 5 to 10 mph.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 93. Heat index values as high as 106. South wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 74. South wind 5 to 10 mph.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. South wind 5 to 10 mph.
Sunday Night
Partly cloudy, with a low around 75. South southeast wind 5 to 10 mph.
Monday
Mostly sunny, with a high near 93. South wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 75. South wind 5 to 10 mph.
Tuesday
Mostly sunny, with a high near 95.
Tuesday Night
Mostly clear, with a low around 75.
Wednesday
Mostly sunny, with a high near 95.
Wednesday Night
Partly cloudy, with a low around 75.
Juneteenth
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 90.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
12:32 am CDT Jun 13, 2025
Forecast Valid:
1am CDT Jun 13, 2025-6pm CDT Jun 19, 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