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

Snow Squalls in the Northeast U.S. on Thursday; Heavy Rain Along the Gulf Coast

An arctic cold front will move through the Great Lakes and Northeast on Thursday, bringing moderate to heavy snow, strong winds, and possible whiteout conditions through Thursday afternoon. A storm system interacting with Gulf moisture will bring moderate to heavy rainfall to the western and central Gulf Coast on Thursday. Isolated instances of flash flooding will be possible. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

52°F

11°C

Humidity 97%
Wind Speed N 12 mph
Barometer 30.06 in (1017.9 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 4 Dec 5:56 am CST
Extended Forecast for

San Marcos Municipal Airport TX

  • Today

    Today: A 40 percent chance of showers, mainly before noon. Cloudy, with a high near 56. North wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 56 °F

    Chance
    Showers

  • Tonight

    Tonight: A 30 percent chance of showers after 3am. Cloudy, with a low around 40. North wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 40 °F

    Cloudy then
    Chance
    Showers

  • Friday

    Friday: A 30 percent chance of showers, mainly before noon. Cloudy, with a high near 54. North wind 5 to 10 mph becoming south southeast in the afternoon.

    High: 54 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 44. South southwest wind around 5 mph.

    Low: 44 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 73. Southwest wind 5 to 10 mph.

    High: 73 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 49. South southwest wind 5 to 10 mph becoming west northwest after midnight.

    Low: 49 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 70. West northwest wind 10 to 15 mph becoming north in the afternoon. Winds could gust as high as 20 mph.

    High: 70 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38. North wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 62. North wind 5 to 10 mph becoming east southeast in the afternoon.

    High: 62 °F

    Sunny

Detailed Forecast

Today
A 40 percent chance of showers, mainly before noon. Cloudy, with a high near 56. North wind 15 to 20 mph, with gusts as high as 30 mph.
Tonight
A 30 percent chance of showers after 3am. Cloudy, with a low around 40. North wind 10 to 15 mph, with gusts as high as 25 mph.
Friday
A 30 percent chance of showers, mainly before noon. Cloudy, with a high near 54. North wind 5 to 10 mph becoming south southeast in the afternoon.
Friday Night
Mostly cloudy, with a low around 44. South southwest wind around 5 mph.
Saturday
Mostly sunny, with a high near 73. Southwest wind 5 to 10 mph.
Saturday Night
Mostly clear, with a low around 49. South southwest wind 5 to 10 mph becoming west northwest after midnight.
Sunday
Sunny, with a high near 70. West northwest wind 10 to 15 mph becoming north in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
Mostly clear, with a low around 38. North wind 10 to 15 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 62. North wind 5 to 10 mph becoming east southeast in the afternoon.
Monday Night
Mostly clear, with a low around 36.
Tuesday
Sunny, with a high near 68.
Tuesday Night
Mostly clear, with a low around 44.
Wednesday
Sunny, with a high near 76.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos Municipal Airport TX
 29.9°N 97.86°W (Elev. 600 ft)
Last Update:
5:42 am CST Dec 4, 2025
Forecast Valid:
6am CST Dec 4, 2025-6pm CST Dec 10, 2025
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

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Chance of Precipitation