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

Frigid Airmass to Bring Significantly Colder Temperatures; Snow Continues Downwind of the Great Lakes

A frigid cold airmass will bring significantly colder weather across the eastern two thirds of the country early this week. Record low temperatures are expected in the Southeast by Tuesday morning. Moderate to heavy lake effect snow will continue downwind of the Great Lakes through Monday. Several inches of snow accumulation is expected, including in portions of the Chicago Metro Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

50°F

10°C

Humidity 39%
Wind Speed N 10 mph
Barometer 30.53 in (1033.5 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 10 Nov 12:56 am CST
Extended Forecast for

4 Miles W San Marcos TX

  • Overnight

    Overnight: Clear, with a low around 38. North wind around 10 mph.

    Low: 38 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 62. North northeast wind 5 to 10 mph.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 35. Calm wind becoming southwest around 5 mph after midnight.

    Low: 35 °F

    Clear

  • Veterans Day

    Veterans Day: Sunny, with a high near 72. South southwest wind 5 to 15 mph, with gusts as high as 30 mph.

    High: 72 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 52. South southwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 52 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 82. South southwest wind around 10 mph, with gusts as high as 25 mph.

    High: 82 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59. South wind around 5 mph.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 84. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 84 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 62. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 38. North wind around 10 mph.
Monday
Sunny, with a high near 62. North northeast wind 5 to 10 mph.
Monday Night
Clear, with a low around 35. Calm wind becoming southwest around 5 mph after midnight.
Veterans Day
Sunny, with a high near 72. South southwest wind 5 to 15 mph, with gusts as high as 30 mph.
Tuesday Night
Clear, with a low around 52. South southwest wind around 10 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 82. South southwest wind around 10 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 59. South wind around 5 mph.
Thursday
Sunny, with a high near 84. South wind 5 to 15 mph, with gusts as high as 25 mph.
Thursday Night
Mostly clear, with a low around 62. South wind around 10 mph, with gusts as high as 20 mph.
Friday
Mostly sunny, with a high near 84.
Friday Night
Mostly cloudy, with a low around 64.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 83.
Saturday Night
A 40 percent chance of showers. Partly cloudy, with a low around 54.
Sunday
A 20 percent chance of showers. Sunny, with a high near 74.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles W San Marcos TX
 29.88°N 97.99°W (Elev. 725 ft)
Last Update:
12:44 am CST Nov 10, 2025
Forecast Valid:
1am CST Nov 10, 2025-6pm CST Nov 16, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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