Threat For Heavy Rainfall And Flash Flooding Continues From The Mid South To The Mid Atlantic; Critical Fire Weather Over The Western U.S.

A slow moving low pressure system will bring a continued threat for heavy rainfall and flooding from portions of the Mid South to the Ohio Valley and Mid Atlantic through midweek. Some areas could see locally significant flooding. Out west,very dry humidity combined with gusty winds will lead to a continued threat for critical fire weather and dry thunderstorms. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

A Few Clouds

86°F

30°C

Humidity 59%
Wind Speed S 6 mph
Barometer 29.92 in (1012.0 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 24 Sep 1:56 pm CDT
Extended Forecast for

San Marcos TX

  • This
    Afternoon

    This Afternoon: Partly sunny, with a high near 88. South southwest wind around 5 mph.

    Partly Sunny

    High: 88 °F

  • Tonight

    Tonight: Patchy fog after 1am.  Otherwise, partly cloudy, with a low around 71. South wind around 5 mph.

    Partly Cloudy
    then Patchy
    Fog

    Low: 71 °F

  • Tuesday

    Tuesday: A slight chance of showers, with thunderstorms also possible after 10am.  Patchy fog before 10am.  Otherwise, mostly sunny, with a high near 92. Heat index values as high as 100. South wind 5 to 10 mph.  Chance of precipitation is 20%.

    Slight Chance
    T-storms and
    Patchy Fog

    High: 92 °F

  • Tuesday
    Night

    Tuesday Night: A 20 percent chance of showers.  Partly cloudy, with a low around 71. South southeast wind 5 to 10 mph.

    Slight Chance
    Showers

    Low: 71 °F

  • Wednesday

    Wednesday: Showers and thunderstorms likely.  Mostly cloudy, with a high near 85. Calm wind becoming north northeast around 5 mph in the afternoon.  Chance of precipitation is 60%.

    T-storms
    Likely

    High: 85 °F

  • Wednesday
    Night

    Wednesday Night: Showers and thunderstorms likely.  Cloudy, with a low around 66. North wind around 5 mph.  Chance of precipitation is 60%.

    T-storms
    Likely

    Low: 66 °F

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms.  Cloudy, with a high near 80. North wind 5 to 10 mph.

    Chance
    T-storms

    High: 80 °F

  • Thursday
    Night

    Thursday Night: A 20 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 69. East northeast wind around 5 mph becoming calm  in the evening.

    Slight Chance
    T-storms

    Low: 69 °F

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms.  Mostly cloudy, with a high near 83. East northeast wind around 5 mph becoming southeast in the afternoon.

    Chance
    T-storms

    High: 83 °F

Detailed Forecast

This Afternoon
Partly sunny, with a high near 88. South southwest wind around 5 mph.
Tonight
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 71. South wind around 5 mph.
Tuesday
A slight chance of showers, with thunderstorms also possible after 10am. Patchy fog before 10am. Otherwise, mostly sunny, with a high near 92. Heat index values as high as 100. South wind 5 to 10 mph. Chance of precipitation is 20%.
Tuesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 71. South southeast wind 5 to 10 mph.
Wednesday
Showers and thunderstorms likely. Mostly cloudy, with a high near 85. Calm wind becoming north northeast around 5 mph in the afternoon. Chance of precipitation is 60%.
Wednesday Night
Showers and thunderstorms likely. Cloudy, with a low around 66. North wind around 5 mph. Chance of precipitation is 60%.
Thursday
A 40 percent chance of showers and thunderstorms. Cloudy, with a high near 80. North wind 5 to 10 mph.
Thursday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69. East northeast wind around 5 mph becoming calm in the evening.
Friday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83. East northeast wind around 5 mph becoming southeast in the afternoon.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85.
Click Map For Forecast
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
2:11 pm CDT Sep 24, 2018
2pm CDT Sep 24, 2018-6pm CDT Sep 30, 2018
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database