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

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

N/A

Humidity NA
Wind Speed E 12 mph
Barometer 30.02 in
Dewpoint N/A
Visibility 10.00 mi
Last update 30 May 6:56 am CDT
Extended Forecast for

San Marcos TX

Flood Advisory until May 30, 08:00am
Click here for hazard details and duration
...
  •  
    Flood Advisory until May 30, 08:00am

    NOW until 8:00am Fri

    Flood Advisory

  • Today

    High: 86 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Tonight

    Tonight: Mostly cloudy, with a low around 68. North northeast wind 5 to 10 mph.

    Low: 68 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 88. Northeast wind around 5 mph.

    High: 88 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 70. East southeast wind around 5 mph becoming calm in the evening.

    Low: 70 °F

    Partly Cloudy

  • Sunday

    Sunday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 94. Calm wind becoming south southwest around 5 mph in the morning. Chance of precipitation is 20%.

    High: 94 °F

    Sunny then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of thunderstorms before 7pm. Partly cloudy, with a low around 73. South southeast wind around 5 mph. Chance of precipitation is 10%.

    Low: 73 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 95 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 75. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Partly Cloudy

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly before 10am. Mostly cloudy, with a high near 86. North northeast wind 5 to 10 mph.
Tonight
Mostly cloudy, with a low around 68. North northeast wind 5 to 10 mph.
Saturday
Mostly cloudy, with a high near 88. Northeast wind around 5 mph.
Saturday Night
Partly cloudy, with a low around 70. East southeast wind around 5 mph becoming calm in the evening.
Sunday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 94. Calm wind becoming south southwest around 5 mph in the morning. Chance of precipitation is 20%.
Sunday Night
A slight chance of thunderstorms before 7pm. Partly cloudy, with a low around 73. South southeast wind around 5 mph. Chance of precipitation is 10%.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. South wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Partly cloudy, with a low around 75. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 95. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Partly cloudy, with a low around 76.
Wednesday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 95.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 75.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 95.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
6:34 am CDT May 30, 2025
Forecast Valid:
7am CDT May 30, 2025-6pm CDT Jun 5, 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