Severe Weather in the Central Plains; Heavy Rainfall in the Tennessee Valley; Critical Fire Weather in the West

Scattered severe storms capable of large to very large hail, severe wind gusts, and a few tornadoes will be possible across the central Plains this evening. Heavy to excessive rainfall may bring a flooding threat from the Great Lakes to the Mid-South through tonight. Hot, dry and windy conditions will continue to bring a critical fire weather threat from the Southwest into the Great Basin. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

76°F

24°C

Humidity 97%
Wind Speed S 7 mph
Barometer 30.03 in (1015.9 mb)
Dewpoint 75°F (24°C)
Visibility 9.00 mi
Heat Index75°F (24°C)
Last update 9 Jun 1:56 am CDT
Extended Forecast for

San Marcos Municipal Airport TX

  • Overnight

    Overnight: Mostly cloudy, with a low around 75. South southeast wind around 5 mph.

    Low: 75 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm.  Mostly cloudy, then gradually becoming sunny, with a high near 91. Heat index values as high as 100. South southeast wind 5 to 10 mph.  Chance of precipitation is 20%.

    High: 91 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 75. Southeast wind 5 to 10 mph.

    Low: 75 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm.  Partly sunny, with a high near 91. Heat index values as high as 102. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 91 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 76. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 93. South wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 93 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 77. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Partly Cloudy

  • Friday

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

    High: 93 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 76. South wind 5 to 10 mph.

    Low: 76 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 75. South southeast wind around 5 mph.
Tuesday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly cloudy, then gradually becoming sunny, with a high near 91. Heat index values as high as 100. South southeast wind 5 to 10 mph. Chance of precipitation is 20%.
Tuesday Night
Partly cloudy, with a low around 75. Southeast wind 5 to 10 mph.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91. Heat index values as high as 102. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 76. South wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday
Partly sunny, with a high near 93. South wind 5 to 15 mph, with gusts as high as 20 mph.
Thursday Night
Partly cloudy, with a low around 77. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. South southeast wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 76. South wind 5 to 10 mph.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 93.
Saturday Night
Partly cloudy, with a low around 76.
Sunday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 93.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Monday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos Municipal Airport TX
 29.88°N 97.86°W (Elev. 600 ft)
1:28 am CDT Jun 9, 2026
2am CDT Jun 9, 2026-6pm CDT Jun 15, 2026
 
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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