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

62°F

17°C

Humidity 44%
Wind Speed SW 9 mph
Barometer 30.15 in (1020.6 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 13 Jan 3:56 pm CST
Extended Forecast for

2 Miles W San Marcos Municipal Airport TX

  • Tonight

    Tonight: Mostly clear, with a low around 44. West southwest wind around 5 mph.

    Low: 44 °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 morning. 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 64. North northwest wind around 5 mph becoming south southeast in the afternoon.

    High: 64 °F

    Sunny

  • Thursday Night

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

    Low: 42 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 70. Southwest wind 5 to 10 mph becoming north in the afternoon.

    High: 70 °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: Mostly sunny, with a high near 61. North northeast wind 5 to 10 mph becoming east in the afternoon.

    High: 61 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 37. Calm wind becoming northwest around 5 mph after midnight.

    Low: 37 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 44. West 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 morning. 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 64. North northwest wind around 5 mph becoming south southeast in the afternoon.
Thursday Night
Clear, with a low around 42. Southwest wind around 5 mph.
Friday
Sunny, with a high near 70. 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
Mostly 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. Calm wind becoming northwest around 5 mph after midnight.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 43.
M.L.King Day
Mostly sunny, with a high near 68.
Monday Night
Mostly cloudy, with a low around 45.
Tuesday
Mostly cloudy, with a high near 62.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles W San Marcos Municipal Airport TX
 29.9°N 97.91°W (Elev. 640 ft)
Last Update:
12:44 pm CST Jan 13, 2026
Forecast Valid:
4pm CST Jan 13, 2026-6pm CST Jan 20, 2026
 
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