Excessive Heat for the South and West; Flash Flooding Conditions in the Southwest U.S.

Dangerous heat is expected across portions of the lower Mississippi Valley today, eastern Oregon Wednesday, central California through Wednesday, and Washington through Saturday. Excessive Heat Warnings are in effect. Monsoonal showers and thunderstorms may result in flash flooding and debris flows over the Southwestern U.S. through Friday. Read More >

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Partly Cloudy

93°F

34°C

Humidity 44%
Wind Speed S 12 G 16 mph
Barometer 29.96 in (1013.5 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 16 Aug 1:56 pm CDT
Extended Forecast for

5 Miles SW San Marcos TX

  • This
    Afternoon

    This Afternoon: Mostly sunny, with a high near 97. Heat index values as high as 103. South southeast wind around 10 mph.

    Mostly Sunny

    High: 97 °F

  • Tonight

    Tonight: Partly cloudy, with a low around 75. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Partly Cloudy

    Low: 75 °F

  • Wednesday

    Wednesday: Mostly sunny, with a high near 98. Heat index values as high as 103. Southwest wind 5 to 10 mph.

    Mostly Sunny

    High: 98 °F

  • Wednesday
    Night

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

    Partly Cloudy

    Low: 74 °F

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm.  Sunny and hot, with a high near 99. Southwest wind 5 to 10 mph becoming south southeast in the afternoon.

    Sunny then
    Chance
    T-storms

    High: 99 °F

  • Thursday
    Night

    Thursday Night: A 40 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 75. North northeast wind 5 to 15 mph becoming south after midnight. Winds could gust as high as 20 mph.

    Chance
    T-storms

    Low: 75 °F

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms.  Mostly sunny, with a high near 94. South wind 5 to 10 mph becoming east southeast in the afternoon.

    Chance
    T-storms

    High: 94 °F

  • Friday
    Night

    Friday Night: A slight chance of showers and thunderstorms.  Partly cloudy, with a low around 74. East southeast wind 5 to 10 mph becoming south after midnight.  Chance of precipitation is 20%.

    Slight Chance
    T-storms

    Low: 74 °F

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 96. South wind 5 to 15 mph, with gusts as high as 20 mph.

    Mostly Sunny
    then Slight
    Chance
    T-storms

    High: 96 °F

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 97. Heat index values as high as 103. South southeast wind around 10 mph.
Tonight
Partly cloudy, with a low around 75. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 98. Heat index values as high as 103. Southwest wind 5 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 74. South wind 5 to 10 mph.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 99. Southwest wind 5 to 10 mph becoming south southeast in the afternoon.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 75. North northeast wind 5 to 15 mph becoming south after midnight. Winds could gust as high as 20 mph.
Friday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94. South wind 5 to 10 mph becoming east southeast in the afternoon.
Friday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. East southeast wind 5 to 10 mph becoming south after midnight. Chance of precipitation is 20%.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. South wind 5 to 15 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 75.
Sunday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 95.
Sunday Night
Mostly cloudy, with a low around 76.
Monday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 97.
Click Map For Forecast
Point Forecast:
5 Miles SW San Marcos TX
 29.83°N 97.99°W (Elev. 676 ft)
1:52 pm CDT Aug 16, 2022
2pm CDT Aug 16, 2022-6pm CDT Aug 22, 2022
 
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Additional Resources

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