Severe Thunderstorm and Flash Flood Threats Tuesday

Risks for severe thunderstorms and flash flooding continue Tuesday over the Central and Southern Plains ahead of low pressure tracking across the region. Very large hail and damaging winds will be the main threats. Flash flooding from potentially excessive rainfall will be possible from the southern Appalachians into the Mid-Atlantic region. Read More >

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

70°F

21°C

Humidity 97%
Wind Speed Calm
Barometer 29.94 in (1012.7 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 18 Jun 3:56 am CDT
Extended Forecast for

San Marcos TX

  • Today

    Today: Patchy fog before 9am.  Otherwise, mostly sunny, with a high near 94. Heat index values as high as 102. East wind around 5 mph becoming south southwest in the morning.

    Patchy Fog
    then Mostly
    Sunny

    High: 94 °F

  • Tonight

    Tonight: Partly cloudy, with a low around 75. Southeast wind around 5 mph.

    Partly Cloudy

    Low: 75 °F

  • Wednesday

    Wednesday: Mostly sunny and hot, with a high near 99. Heat index values as high as 108. South southwest wind 5 to 10 mph.

    Hot

    High: 99 °F

  • Wednesday
    Night

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

    Partly Cloudy

    Low: 76 °F

  • Thursday

    Thursday: Sunny and hot, with a high near 102. South wind around 10 mph.

    Hot

    High: 102 °F

  • Thursday
    Night

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

    Partly Cloudy

    Low: 75 °F

  • Friday

    Friday: Mostly sunny, with a high near 98. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Mostly Sunny

    High: 98 °F

  • Friday
    Night

    Friday Night: Mostly cloudy, with a low around 77. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Mostly Cloudy

    Low: 77 °F

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms.  Partly sunny, with a high near 95. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Slight Chance
    T-storms

    High: 95 °F

Detailed Forecast

Today
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 94. Heat index values as high as 102. East wind around 5 mph becoming south southwest in the morning.
Tonight
Partly cloudy, with a low around 75. Southeast wind around 5 mph.
Wednesday
Mostly sunny and hot, with a high near 99. Heat index values as high as 108. South southwest wind 5 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 76. South wind 10 to 15 mph.
Thursday
Sunny and hot, with a high near 102. South wind around 10 mph.
Thursday Night
Partly cloudy, with a low around 75. South southeast wind around 10 mph.
Friday
Mostly sunny, with a high near 98. South wind 10 to 15 mph, with gusts as high as 20 mph.
Friday Night
Mostly cloudy, with a low around 77. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 95. South wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 76.
Sunday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 95.
Sunday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 75.
Monday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 95.
Click Map For Forecast
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
4:11 am CDT Jun 18, 2019
4am CDT Jun 18, 2019-6pm CDT Jun 24, 2019
 
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Additional Resources

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