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Heavy Rain and Flooding in the Southern Plains

A cold front in the southern Plains will produce heavy rain and a flooding threat in the Arklatex area. These storms are expected to sink southward and weaken over South Texas on Thursday, and produce some moderate to locally heavy rainfall across southern Texas through the week. Read More >

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

85°F

29°C

Humidity 72%
Wind Speed SE 14 mph
Barometer 29.83 in (1009.3 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 4 Oct 8:56 pm CDT
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 72. South wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Chance
    T-storms then
    Showers
    Likely

    Low: 72 °F

  • Thursday

    Thursday: Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms, mainly between 1pm and 4pm. High near 83. Northeast wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    T-storms

    High: 83 °F

  • Thursday
    Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 69. North northeast wind around 10 mph.

    Slight Chance
    T-storms

    Low: 69 °F

  • Friday

    Friday: Partly sunny, with a high near 83. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Partly Sunny

    High: 83 °F

  • Friday
    Night

    Friday Night: Mostly cloudy, with a low around 62. North northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Mostly Cloudy

    Low: 62 °F

  • Saturday

    Saturday: Partly sunny, with a high near 74. North northeast wind 15 to 20 mph, with gusts as high as 30 mph.

    Partly Sunny

    High: 74 °F

  • Saturday
    Night

    Saturday Night: Partly cloudy, with a low around 53. Northeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Partly Cloudy

    Low: 53 °F

  • Sunday

    Sunday: Mostly sunny, with a high near 78. North wind 5 to 10 mph becoming south in the afternoon.

    Mostly Sunny

    High: 78 °F

  • Sunday
    Night

    Sunday Night: Mostly clear, with a low around 56. South wind 5 to 10 mph.

    Mostly Clear

    Low: 56 °F

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 72. South wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms, mainly between 1pm and 4pm. High near 83. Northeast wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 69. North northeast wind around 10 mph.
Friday
Partly sunny, with a high near 83. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
Mostly cloudy, with a low around 62. North northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday
Partly sunny, with a high near 74. North northeast wind 15 to 20 mph, with gusts as high as 30 mph.
Saturday Night
Partly cloudy, with a low around 53. Northeast wind 5 to 15 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 78. North wind 5 to 10 mph becoming south in the afternoon.
Sunday Night
Mostly clear, with a low around 56. South wind 5 to 10 mph.
Columbus Day
Sunny, with a high near 83.
Monday Night
Mostly clear, with a low around 60.
Tuesday
Mostly sunny, with a high near 87.
Tuesday Night
Partly cloudy, with a low around 64.
Wednesday
Mostly sunny, with a high near 84.
Click Map For Forecast
Disclaimer
Map Legend
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
2:42 pm CDT Oct 4, 2023
Forecast Valid:
9pm CDT Oct 4, 2023-6pm CDT Oct 11, 2023
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation