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

Dangerous Cold Persists through Monday; Wintry Weather from the Northern Plains to the Great Lakes

Bitter cold temperatures and dangerous wind chills will persist from Florida to the Northeast through the day. Daily record low temperatures are forecast across the Southeast and Florida, with some all-time February low temperature records possible across Florida. An Alberta clipper will spread wintry precipitation across the Northern Plains today and into the upper Great Lakes into tonight. Read More >

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

42°F

6°C

Humidity 89%
Wind Speed Calm
Barometer 30.35 in (1028.0 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 2 Feb 8:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Patchy fog before 10am. Otherwise, partly sunny, with a high near 68. South southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 68 °F

    Patchy Fog
    then Partly
    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 57. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 57 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 71. South southwest wind 5 to 10 mph becoming north in the afternoon.

    High: 71 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 45. North wind 5 to 10 mph.

    Low: 45 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 64. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 64 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 39. North wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 39 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 66. North northwest wind around 5 mph becoming calm in the morning.

    High: 66 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 41. Calm wind becoming west southwest around 5 mph after midnight.

    Low: 41 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 72. West wind 5 to 10 mph.

    High: 72 °F

    Sunny

Detailed Forecast

Today
Patchy fog before 10am. Otherwise, partly sunny, with a high near 68. South southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Tonight
Mostly cloudy, with a low around 57. South wind around 10 mph, with gusts as high as 20 mph.
Tuesday
Mostly cloudy, with a high near 71. South southwest wind 5 to 10 mph becoming north in the afternoon.
Tuesday Night
Partly cloudy, with a low around 45. North wind 5 to 10 mph.
Wednesday
Sunny, with a high near 64. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 39. North wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 66. North northwest wind around 5 mph becoming calm in the morning.
Thursday Night
Clear, with a low around 41. Calm wind becoming west southwest around 5 mph after midnight.
Friday
Sunny, with a high near 72. West wind 5 to 10 mph.
Friday Night
Mostly clear, with a low around 45.
Saturday
Sunny, with a high near 75.
Saturday Night
Mostly clear, with a low around 50.
Sunday
Mostly sunny, with a high near 76.
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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:
8:42 am CST Feb 2, 2026
Forecast Valid:
9am CST Feb 2, 2026-6pm CST Feb 8, 2026
 
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Additional Resources

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Chance of Precipitation