Dangerous Heat Building in the West; Severe Storms in the Upper Midwest

A long duration heat wave will build across the Southwest, California, and Pacific Northwest. Dangerous heat is also forecast for the Great Basin and South Plains. Severe storms in the Upper Midwest may have locally heavy rain, damaging winds, and very large hail. Heavy rain and flooding will also be possible in the Deep South and Appalachians. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

87°F

31°C

Humidity 57%
Wind Speed S 9 mph
Barometer 29.93 in (1012.4 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 13 Aug 10:56 pm CDT
Extended Forecast for

San Marcos TX

Heat Advisory until August 15, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until August 15, 07:00pm

    NOW until
    7:00pm Sat

    Heat Advisory

  • Tonight

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

    Mostly Clear

    Low: 75 °F

  • Friday

    Friday: Sunny and hot, with a high near 103. South southwest wind 5 to 10 mph.

    Hot

    High: 103 °F

  • Friday
    Night

    Friday Night: Clear, with a low around 75. South wind around 10 mph.

    Clear

    Low: 75 °F

  • Saturday

    Saturday: Sunny and hot, with a high near 103. Heat index values as high as 107. South southwest wind around 5 mph.

    Hot

    High: 103 °F

  • Saturday
    Night

    Saturday Night: Mostly clear, with a low around 76. South wind around 5 mph.

    Mostly Clear

    Low: 76 °F

  • Sunday

    Sunday: Sunny and hot, with a high near 104. South southwest wind around 5 mph becoming southeast in the afternoon.

    Hot

    High: 104 °F

  • Sunday
    Night

    Sunday Night: Partly cloudy, with a low around 76. Southeast wind around 5 mph becoming calm  after midnight.

    Partly Cloudy

    Low: 76 °F

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms.  Partly sunny and hot, with a high near 99. Calm wind becoming north around 5 mph in the morning.

    Chance
    T-storms

    High: 99 °F

Detailed Forecast

Tonight
Mostly clear, with a low around 75. South southwest wind 5 to 10 mph.
Friday
Sunny and hot, with a high near 103. South southwest wind 5 to 10 mph.
Friday Night
Clear, with a low around 75. South wind around 10 mph.
Saturday
Sunny and hot, with a high near 103. Heat index values as high as 107. South southwest wind around 5 mph.
Saturday Night
Mostly clear, with a low around 76. South wind around 5 mph.
Sunday
Sunny and hot, with a high near 104. South southwest wind around 5 mph becoming southeast in the afternoon.
Sunday Night
Partly cloudy, with a low around 76. Southeast wind around 5 mph becoming calm after midnight.
Monday
A 30 percent chance of showers and thunderstorms. Partly sunny and hot, with a high near 99. Calm wind becoming north around 5 mph in the morning.
Monday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Northeast wind around 5 mph becoming calm in the evening.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Tuesday Night
Mostly clear, with a low around 72.
Wednesday
Mostly sunny, with a high near 96.
Wednesday Night
Partly cloudy, with a low around 72.
Thursday
Mostly sunny, with a high near 95.
Click Map For Forecast
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
11:43 pm CDT Aug 13, 2020
11pm CDT Aug 13, 2020-6pm CDT Aug 20, 2020
 
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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