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

Heavy Lake Effect Snow Downwind of Lakes Erie and Ontario; Fire Weather Concerns in the Southern Plains and Southeast

A multi-day heavy lake effect snow event is expected downwind of Lakes Erie and Ontario through New Year's Day. There is increasing confidence in snow squalls causing bursts of snow & gusty winds on New Year's Eve. Elevated fire weather conditions will continue today over parts of the Southern Plains and across much of the Southeast U.S. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

59°F

15°C

Humidity 18%
Wind Speed NE 7 mph
Barometer 30.42 in (1030.1 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Last update 30 Dec 2:56 pm CST
Extended Forecast for

San Marcos Municipal Airport TX

  • This Afternoon

    This Afternoon: Sunny, with a high near 58. North wind around 5 mph.

    High: 58 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 29. Calm wind becoming west around 5 mph.

    Low: 29 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 68. West southwest wind 5 to 10 mph.

    High: 68 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 40. Southwest wind around 5 mph.

    Low: 40 °F

    Mostly Clear

  • New Year's Day

    New Year's Day: Mostly sunny, with a high near 73. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 73 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 54. South southwest wind around 10 mph.

    Low: 54 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 85. Southwest wind around 10 mph, with gusts as high as 20 mph.

    High: 85 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 49. West wind around 5 mph becoming north after midnight.

    Low: 49 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 74. North wind around 5 mph.

    High: 74 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 58. North wind around 5 mph.
Tonight
Mostly clear, with a low around 29. Calm wind becoming west around 5 mph.
Wednesday
Sunny, with a high near 68. West southwest wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 40. Southwest wind around 5 mph.
New Year's Day
Mostly sunny, with a high near 73. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Thursday Night
Partly cloudy, with a low around 54. South southwest wind around 10 mph.
Friday
Sunny, with a high near 85. Southwest wind around 10 mph, with gusts as high as 20 mph.
Friday Night
Clear, with a low around 49. West wind around 5 mph becoming north after midnight.
Saturday
Sunny, with a high near 74. North wind around 5 mph.
Saturday Night
Clear, with a low around 46.
Sunday
Sunny, with a high near 77.
Sunday Night
Partly cloudy, with a low around 55.
Monday
Partly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos Municipal Airport TX
 29.88°N 97.86°W (Elev. 600 ft)
Last Update:
12:44 pm CST Dec 30, 2025
Forecast Valid:
3pm CST Dec 30, 2025-6pm CST Jan 5, 2026
 
Forecast Discussion
 
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