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

Widespread Rain from Texas to the Central Appalachians; Heavy to Excessive Rainfall in Southern California and the Southwest

Scattered thunderstorms and widespread showers are expected from the Texas coast to the central Appalachians today. Heavy to excessive rainfall will continue in southern California into the Desert Southwest through Saturday. Heavy rain will pose a risk of flash flooding, especially across burn scar and urbanized regions. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Partly Cloudy

65°F

18°C

Humidity 66%
Wind Speed N 13 mph
Barometer 30.21 in (1022.6 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 22 Nov 9:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 76. North northeast wind around 10 mph, with gusts as high as 20 mph.

    High: 76 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 56. North northeast wind around 5 mph.

    Low: 56 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 73. Northeast wind 5 to 10 mph becoming east southeast in the afternoon.

    High: 73 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 30 percent chance of showers, mainly before midnight. Cloudy, with a low around 65. South southeast wind 5 to 10 mph.

    Low: 65 °F

    Chance
    Showers

  • Monday

    Monday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 79. South wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 79 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 55. Southwest wind around 5 mph becoming calm in the evening.

    Low: 55 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 79. Northwest wind around 5 mph.

    High: 79 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 49. North wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 49 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 65. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 65 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 76. North northeast wind around 10 mph, with gusts as high as 20 mph.
Tonight
Increasing clouds, with a low around 56. North northeast wind around 5 mph.
Sunday
Mostly cloudy, with a high near 73. Northeast wind 5 to 10 mph becoming east southeast in the afternoon.
Sunday Night
A 30 percent chance of showers, mainly before midnight. Cloudy, with a low around 65. South southeast wind 5 to 10 mph.
Monday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 79. South wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Monday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 55. Southwest wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 79. Northwest wind around 5 mph.
Tuesday Night
Mostly clear, with a low around 49. North wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 65. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 43.
Thanksgiving Day
Mostly sunny, with a high near 64.
Thursday Night
Partly cloudy, with a low around 45.
Friday
Mostly sunny, with a high near 69.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
10:33 am CST Nov 22, 2025
Forecast Valid:
10am CST Nov 22, 2025-6pm CST Nov 28, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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