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Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

27°C

80°F

Humidity 90%
Wind Speed S 9 km/h
Barometer 1015.8 mb (30.03 in)
Dewpoint 25°C (77°F)
Visibility 16 km
Heat Index30°C (86°F)
Last update 12 Jul 11:56 pm CDT
Extended Forecast for

4 Miles NNW San Marcos Municipal Airport TX

Flood Watch July 13, 12:55am until July 13, 07:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch July 13, 12:55am until July 13, 07:00pm

    NOW until 7:00pm Sun

    Flood Watch

  • Overnight

    Low: 24 °C

    Mostly Cloudy

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 33. South wind 10 to 15 km/h, with gusts as high as 30 km/h. Chance of precipitation is 50%. New rainfall amounts between 5 and 7.5 mm possible.

    High: 33 °C

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before 10pm. Mostly cloudy, with a low around 23. Southeast wind 10 to 15 km/h becoming south southwest after midnight.

    Low: 23 °C

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Monday

    Monday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 33. South wind 5 to 10 km/h. Chance of precipitation is 20%.

    High: 33 °C

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: A slight chance of thunderstorms before 7pm. Mostly cloudy, with a low around 23. South southeast wind 10 to 15 km/h. Chance of precipitation is 10%.

    Low: 23 °C

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 34. South wind 5 to 10 km/h increasing to 10 to 15 km/h in the afternoon. Winds could gust as high as 30 km/h.

    High: 34 °C

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 23. South wind 10 to 15 km/h, with gusts as high as 30 km/h.

    Low: 23 °C

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 34. South wind 10 to 20 km/h, with gusts as high as 35 km/h.

    High: 34 °C

    Mostly Sunny

Detailed Forecast

Overnight
Mostly cloudy, with a low around 24. South wind 10 to 15 km/h.
Sunday
A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 33. South wind 10 to 15 km/h, with gusts as high as 30 km/h. Chance of precipitation is 50%. New rainfall amounts between 5 and 7.5 mm possible.
Sunday Night
A 20 percent chance of showers and thunderstorms before 10pm. Mostly cloudy, with a low around 23. Southeast wind 10 to 15 km/h becoming south southwest after midnight.
Monday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 33. South wind 5 to 10 km/h. Chance of precipitation is 20%.
Monday Night
A slight chance of thunderstorms before 7pm. Mostly cloudy, with a low around 23. South southeast wind 10 to 15 km/h. Chance of precipitation is 10%.
Tuesday
Partly sunny, with a high near 34. South wind 5 to 10 km/h increasing to 10 to 15 km/h in the afternoon. Winds could gust as high as 30 km/h.
Tuesday Night
Mostly cloudy, with a low around 23. South wind 10 to 15 km/h, with gusts as high as 30 km/h.
Wednesday
Mostly sunny, with a high near 34. South wind 10 to 20 km/h, with gusts as high as 35 km/h.
Wednesday Night
Partly cloudy, with a low around 22. South southeast wind 10 to 15 km/h, with gusts as high as 30 km/h.
Thursday
Mostly sunny, with a high near 34.
Thursday Night
Partly cloudy, with a low around 22.
Friday
Mostly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Mostly sunny, with a high near 35.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 m)
Last Update:
12:44 am CDT Jul 13, 2025
Forecast Valid:
12am CDT Jul 13, 2025-6pm CDT Jul 19, 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