Severe Weather in the Plains; Heavy Rainfall in the Ohio and Tennessee Valleys; Heat Wave in the Central U.S.

Numerous severe storms with a potential for severe wind gusts, tornadoes (some potentially strong), and very large hail are expected in parts of the central and northern Plains. Heavy rainfall may bring a flooding threat to parts of the northern Plains and from the Ohio Valley to the Southeast. Fire weather concerns persist in the Four Corners Region. Hot and humid expected in the central U.S.. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

84°F

29°C

Humidity 80%
Wind Speed SE 12 mph
Barometer 30.06 in (1017.3 mb)
Dewpoint 77°F (25°C)
Visibility 8.00 mi
Heat Index94°F (34°C)
Last update 9 Jun 9:56 am CDT
Extended Forecast for

2 Miles WSW San Marcos TX

  • Today

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

    High: 91 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: Increasing clouds, with a low around 75. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Increasing
    Clouds

  • 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 southeast 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 92. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 92 °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 92. South southeast wind 5 to 10 mph.

    High: 92 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

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

    Low: 75 °F

    Partly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 92. South southeast wind 5 to 10 mph.

    High: 92 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 91. Heat index values as high as 100. South southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Tonight
Increasing clouds, with a low around 75. Southeast wind 5 to 10 mph, with gusts as high as 20 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 southeast 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 92. South wind 5 to 10 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 92. South southeast wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 75. Southeast wind 5 to 10 mph.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92. South southeast wind 5 to 10 mph.
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 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
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:
2 Miles WSW San Marcos TX
 29.86°N 97.97°W (Elev. 646 ft)
6:42 am CDT Jun 9, 2026
10am 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