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

Snow Squalls from the Upper Midwest to Great Lakes; High Winds in the Northern and Central Plains

An Arctic front will bring widespread snow squalls through Friday from the Upper Midwest to the Ohio Valley. Heavy snow rates and strong winds will lead to near-zero visibility and dangerous travel conditions. High winds will continue across the northern and central High Plains through Friday, with wind gusts above 60 mph likely, leading to hazardous travel conditions. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

44°F

7°C

Humidity 68%
Wind Speed S 8 mph
Barometer 29.93 in (1013.2 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 16 Jan 4:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 73. Southwest wind 10 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph.

    High: 73 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 40. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 40 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 55. North northeast wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 55 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 27. North northeast wind 5 to 10 mph becoming northwest after midnight. Winds could gust as high as 20 mph.

    Low: 27 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 61. West northwest wind 5 to 10 mph becoming south southwest in the afternoon.

    High: 61 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37. South southwest wind around 5 mph becoming calm after midnight.

    Low: 37 °F

    Mostly Clear

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 64. Calm wind becoming south southeast around 5 mph in the morning.

    High: 64 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 43. Northeast wind around 5 mph.

    Low: 43 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Cloudy, with a high near 58. East wind around 5 mph.

    High: 58 °F

    Cloudy

Detailed Forecast

Today
Sunny, with a high near 73. Southwest wind 10 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph.
Tonight
Mostly clear, with a low around 40. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday
Mostly sunny, with a high near 55. North northeast wind 10 to 15 mph, with gusts as high as 30 mph.
Saturday Night
Mostly clear, with a low around 27. North northeast wind 5 to 10 mph becoming northwest after midnight. Winds could gust as high as 20 mph.
Sunday
Sunny, with a high near 61. West northwest wind 5 to 10 mph becoming south southwest in the afternoon.
Sunday Night
Mostly clear, with a low around 37. South southwest wind around 5 mph becoming calm after midnight.
M.L.King Day
Mostly sunny, with a high near 64. Calm wind becoming south southeast around 5 mph in the morning.
Monday Night
Mostly cloudy, with a low around 43. Northeast wind around 5 mph.
Tuesday
Cloudy, with a high near 58. East wind around 5 mph.
Tuesday Night
A 30 percent chance of showers, mainly after midnight. Cloudy, with a low around 48.
Wednesday
A 40 percent chance of showers. Cloudy, with a high near 65.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 54.
Thursday
Partly sunny, with a high near 72.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.91°W (Elev. 597 ft)
Last Update:
5:44 am CST Jan 16, 2026
Forecast Valid:
5am CST Jan 16, 2026-6pm CST Jan 22, 2026
 
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