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

Above Average Temperatures for Most Today; Winter Weather Returns to the Upper Midwest and Great Lakes

Well above average temperatures are forecast today into Wednesday over most of the lower 48 states away from the Gulf Coast. A storm system passing across southern Canada will bring a wintry mix to the upper Great Lakes today. A trailing cold front will then bring the wintry mix from the central Appalachians through the Northeast U.S. Wednesday and Thursday. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

58°F

14°C

Humidity 53%
Wind Speed SW 8 mph
Barometer 30.20 in (1022.6 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 13 Jan 1:56 pm CST
Extended Forecast for

4 Miles WNW San Marcos TX

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 63. Southwest wind around 5 mph.

    High: 63 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 45. South southwest wind around 5 mph.

    Low: 45 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 69. West wind 5 to 10 mph becoming north 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 69 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 37. North wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 37 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 63. North northwest wind around 5 mph becoming south in the afternoon.

    High: 63 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 42. South wind around 5 mph.

    Low: 42 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 69. Southwest wind 5 to 10 mph becoming north in the afternoon.

    High: 69 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 40. North northeast wind 5 to 10 mph.

    Low: 40 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 61. North northeast wind 5 to 10 mph becoming east in the afternoon.

    High: 61 °F

    Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 63. Southwest wind around 5 mph.
Tonight
Mostly clear, with a low around 45. South southwest wind around 5 mph.
Wednesday
Sunny, with a high near 69. West wind 5 to 10 mph becoming north 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Wednesday Night
Clear, with a low around 37. North wind 5 to 15 mph, with gusts as high as 25 mph.
Thursday
Sunny, with a high near 63. North northwest wind around 5 mph becoming south in the afternoon.
Thursday Night
Clear, with a low around 42. South wind around 5 mph.
Friday
Sunny, with a high near 69. Southwest wind 5 to 10 mph becoming north in the afternoon.
Friday Night
Mostly clear, with a low around 40. North northeast wind 5 to 10 mph.
Saturday
Sunny, with a high near 61. North northeast wind 5 to 10 mph becoming east in the afternoon.
Saturday Night
Mostly clear, with a low around 37.
Sunday
Sunny, with a high near 66.
Sunday Night
Mostly clear, with a low around 43.
M.L.King Day
Mostly sunny, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW San Marcos TX
 29.9°N 97.99°W (Elev. 850 ft)
Last Update:
12:44 pm CST Jan 13, 2026
Forecast Valid:
2pm CST Jan 13, 2026-6pm CST Jan 19, 2026
 
Forecast Discussion
 
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Additional Resources

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