National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Widespread Showers and Thunderstorms in Southern California and the Southern Plains into the Mississippi Valley

Isolated strong to severe thunderstorms and widespread heavy rainfall are possible across the southern Plains into Arkansas. Widespread showers with a slight chance of thunderstorms are possible across southern California. Urban flooding, rock and mudslides as well as minor debris flows near burn scars are possible. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Light Rain and Breezy

70°F

21°C

Humidity 82%
Wind Speed N 22 mph
Barometer 29.89 in (1011.7 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 20 Nov 6:56 pm CST
Extended Forecast for

5 Miles SW San Marcos TX

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Southeast wind 5 to 10 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 67 °F

    Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms before noon, then a slight chance of showers between noon and 3pm. Cloudy through mid morning, then gradual clearing, with a high near 80. Southwest wind around 5 mph becoming north in the afternoon. Chance of precipitation is 40%.

    High: 80 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A slight chance of showers, then a chance of showers and thunderstorms after midnight. Partly cloudy, with a low around 63. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 30%.

    Low: 63 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms. Partly sunny, with a high near 76. Northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 76 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 61. Northeast wind around 5 mph.

    Low: 61 °F

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 76. East northeast wind around 10 mph becoming south southeast in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 65 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday

    Monday: Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 77. South wind 5 to 10 mph becoming west northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 70%.

    High: 77 °F

    Showers
    Likely

  • Monday Night

    Monday Night: Mostly clear, with a low around 52. Calm wind becoming northwest around 5 mph after midnight.

    Low: 52 °F

    Mostly Clear

Detailed Forecast

Tonight
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Southeast wind 5 to 10 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
A chance of showers and thunderstorms before noon, then a slight chance of showers between noon and 3pm. Cloudy through mid morning, then gradual clearing, with a high near 80. Southwest wind around 5 mph becoming north in the afternoon. Chance of precipitation is 40%.
Friday Night
A slight chance of showers, then a chance of showers and thunderstorms after midnight. Partly cloudy, with a low around 63. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 30%.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 76. Northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Saturday Night
A 30 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 61. Northeast wind around 5 mph.
Sunday
A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 76. East northeast wind around 10 mph becoming south southeast in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 40%.
Sunday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. South southeast wind around 10 mph, with gusts as high as 20 mph.
Monday
Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 77. South wind 5 to 10 mph becoming west northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 70%.
Monday Night
Mostly clear, with a low around 52. Calm wind becoming northwest around 5 mph after midnight.
Tuesday
Sunny, with a high near 78.
Tuesday Night
Partly cloudy, with a low around 50.
Wednesday
Mostly sunny, with a high near 66.
Wednesday Night
Mostly clear, with a low around 43.
Thanksgiving Day
Sunny, with a high near 65.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SW San Marcos TX
 29.83°N 97.99°W (Elev. 676 ft)
Last Update:
6:26 pm CST Nov 20, 2025
Forecast Valid:
7pm CST Nov 20, 2025-6pm CST Nov 27, 2025
 
Forecast Discussion
 
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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