Severe Thunderstorms in the Upper Midwest; Excessive Heat in the Central U.S.

Severe thunderstorms, capable of severe wind (locally exceeding hurricane force), very large hail, flash flooding, and a few tornadoes, are possible late this afternoon into tonight across portions of the of the Upper Midwest into the southern Great Lakes. Excessive heat covers much of the central third of the country and is expected to persist into the weekend over the south-central states. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

92°F

33°C

Humidity 52%
Wind Speed SE 10 mph
Barometer 29.98 in (1014.3 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 28 Jul 5:56 pm CDT
Extended Forecast for

4 Miles NNW San Marcos Municipal Airport TX

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 7pm.  Partly cloudy, with a low around 74. Southeast wind 5 to 10 mph becoming south southwest after midnight.

    Slight Chance
    T-storms then
    Partly Cloudy

    Low: 74 °F

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm.  Sunny, with a high near 95. Heat index values as high as 102. Southwest wind 5 to 10 mph becoming east in the afternoon.

    Sunny then
    Slight Chance
    T-storms

    High: 95 °F

  • Thursday
    Night

    Thursday Night: Mostly clear, with a low around 74. East wind 5 to 10 mph becoming south southwest after midnight.

    Mostly Clear

    Low: 74 °F

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 95. Heat index values as high as 104. Southeast wind 5 to 10 mph.

    Mostly Sunny
    then Slight
    Chance
    T-storms

    High: 95 °F

  • Friday
    Night

    Friday Night: Partly cloudy, with a low around 74. Southeast wind 5 to 10 mph.

    Partly Cloudy

    Low: 74 °F

  • Saturday

    Saturday: Sunny, with a high near 96. South southwest wind 5 to 10 mph.

    Sunny

    High: 96 °F

  • Saturday
    Night

    Saturday Night: Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.

    Mostly Clear

    Low: 75 °F

  • Sunday

    Sunday: Sunny, with a high near 98. South southwest wind 5 to 10 mph.

    Sunny

    High: 98 °F

  • Sunday
    Night

    Sunday Night: Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.

    Mostly Clear

    Low: 75 °F

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 74. Southeast wind 5 to 10 mph becoming south southwest after midnight.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 95. Heat index values as high as 102. Southwest wind 5 to 10 mph becoming east in the afternoon.
Thursday Night
Mostly clear, with a low around 74. East wind 5 to 10 mph becoming south southwest after midnight.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. Heat index values as high as 104. Southeast wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 74. Southeast wind 5 to 10 mph.
Saturday
Sunny, with a high near 96. South southwest wind 5 to 10 mph.
Saturday Night
Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.
Sunday
Sunny, with a high near 98. South southwest wind 5 to 10 mph.
Sunday Night
Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
Tuesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 94.
Tuesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 74.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Click Map For Forecast
Point Forecast:
4 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
1:46 pm CDT Jul 28, 2021
6pm CDT Jul 28, 2021-6pm CDT Aug 4, 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