Severe Thunderstorm and Flash Flooding Threats in the South

Organized severe thunderstorms capable of producing mainly large hail and perhaps damaging winds are expected across portions of Louisiana this afternoon with a second round further west tonight. Heavy thunderstorms may lead to flash flooding over portions of the northern Gulf Coast today through Saturday. Several inches of excessive rainfall are possible with Flash Flood Watches in effect. 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 51%
Wind Speed NE 9 mph
Barometer 29.90 in (1011.6 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 13 Apr 3:56 pm CDT
Extended Forecast for

3 Miles NNW San Marcos Municipal Airport TX

  • This
    Afternoon

    This Afternoon: A 20 percent chance of showers.  Partly sunny, with a high near 78. North northeast wind around 10 mph.

    Slight Chance
    Showers

    High: 78 °F

  • Tonight

    Tonight: A slight chance of showers, then a chance of showers and thunderstorms after 7pm.  Mostly cloudy, with a low around 65. North northeast wind 5 to 10 mph.  Chance of precipitation is 30%.

    Chance
    T-storms

    Low: 65 °F

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 1pm.  Mostly cloudy, with a high near 78. North wind 5 to 10 mph, with gusts as high as 20 mph.

    Chance
    T-storms

    High: 78 °F

  • Wednesday
    Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 59. North northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Chance
    T-storms

    Low: 59 °F

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly after 1pm.  Cloudy, with a high near 71. North northeast wind around 10 mph, with gusts as high as 20 mph.

    Chance
    T-storms

    High: 71 °F

  • Thursday
    Night

    Thursday Night: A 30 percent chance of showers and thunderstorms.  Cloudy, with a low around 61. East northeast wind 5 to 10 mph.

    Chance
    T-storms

    Low: 61 °F

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms.  Cloudy, with a high near 79. East wind 5 to 10 mph becoming southwest in the afternoon.

    Chance
    T-storms

    High: 79 °F

  • Friday
    Night

    Friday Night: A 30 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 51. North wind 5 to 15 mph, with gusts as high as 25 mph.

    Chance
    T-storms

    Low: 51 °F

  • Saturday

    Saturday: A 30 percent chance of showers.  Mostly cloudy, with a high near 66. North wind 15 to 20 mph, with gusts as high as 25 mph.

    Chance
    Showers

    High: 66 °F

Detailed Forecast

This Afternoon
A 20 percent chance of showers. Partly sunny, with a high near 78. North northeast wind around 10 mph.
Tonight
A slight chance of showers, then a chance of showers and thunderstorms after 7pm. Mostly cloudy, with a low around 65. North northeast wind 5 to 10 mph. Chance of precipitation is 30%.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 78. North wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59. North northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Cloudy, with a high near 71. North northeast wind around 10 mph, with gusts as high as 20 mph.
Thursday Night
A 30 percent chance of showers and thunderstorms. Cloudy, with a low around 61. East northeast wind 5 to 10 mph.
Friday
A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 79. East wind 5 to 10 mph becoming southwest in the afternoon.
Friday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 51. North wind 5 to 15 mph, with gusts as high as 25 mph.
Saturday
A 30 percent chance of showers. Mostly cloudy, with a high near 66. North wind 15 to 20 mph, with gusts as high as 25 mph.
Saturday Night
A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 48.
Sunday
A 20 percent chance of showers. Partly sunny, with a high near 68.
Sunday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 48.
Monday
A 20 percent chance of showers. Partly sunny, with a high near 71.
Monday Night
Partly cloudy, with a low around 47.
Tuesday
Mostly sunny, with a high near 76.
Click Map For Forecast
Point Forecast:
3 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
2:15 pm CDT Apr 13, 2021
4pm CDT Apr 13, 2021-6pm CDT Apr 20, 2021
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database