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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

48°F

9°C

Humidity 86%
Wind Speed NW 6 mph
Barometer 30.33 in (1026.8 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 13 Jan 8:56 am CST
Extended Forecast for

2 Miles W San Marcos Municipal Airport TX

  • Today

    Today: A 20 percent chance of showers before noon. Cloudy, then gradually becoming mostly sunny, with a high near 64. West southwest wind around 5 mph.

    High: 64 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 43. West southwest wind around 5 mph.

    Low: 43 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 70. West wind 5 to 10 mph becoming north 15 to 20 mph in the morning. Winds could gust as high as 30 mph.

    High: 70 °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. South southwest 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 64. North wind 5 to 10 mph becoming east in the afternoon.

    High: 64 °F

    Sunny

Detailed Forecast

Today
A 20 percent chance of showers before noon. Cloudy, then gradually becoming mostly sunny, with a high near 64. West southwest wind around 5 mph.
Tonight
Mostly clear, with a low around 43. West southwest wind around 5 mph.
Wednesday
Sunny, with a high near 70. 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. South southwest 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 64. North 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 63.
Sunday Night
Partly cloudy, with a low around 34.
M.L.King Day
Mostly sunny, with a high near 61.
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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:
8:40 am CST Jan 13, 2026
Forecast Valid:
9am CST Jan 13, 2026-6pm CST Jan 19, 2026
 
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Additional Resources

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