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Above Average Temperatures in the West; Winter Weather Returns to the Upper Midwest and Great Lakes

Well above average temperatures will continue across the West this week, potentially breaking some daily high temperature records. A storm system dropping south out of Canada will bring a wintry mix to the Upper Midwest and Great Lakes Tuesday, pushing into the Central Appalachians and interior Northeast on Wednesday. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

A Few Clouds

50°F

10°C

Humidity 43%
Wind Speed Calm
Barometer 30.37 in (1028.4 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 12 Jan 10:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: A 20 percent chance of showers after 3am. Mostly cloudy, with a low around 47. Calm wind becoming west around 5 mph.

    Low: 47 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: A 20 percent chance of showers before noon. Cloudy, then gradually becoming mostly sunny, with a high near 63. West southwest wind around 5 mph.

    High: 63 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: 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 38. North wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 38 °F

    Clear

  • Thursday

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

    High: 63 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 43. South southwest wind around 5 mph.

    Low: 43 °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 41. North northeast wind 5 to 10 mph.

    Low: 41 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of showers after 3am. Mostly cloudy, with a low around 47. Calm wind becoming west around 5 mph.
Tuesday
A 20 percent chance of showers before noon. Cloudy, then gradually becoming mostly sunny, with a high near 63. West southwest wind around 5 mph.
Tuesday Night
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 38. 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 southeast in the afternoon.
Thursday Night
Clear, with a low around 43. 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 41. North northeast wind 5 to 10 mph.
Saturday
Sunny, with a high near 63.
Saturday Night
Mostly clear, with a low around 38.
Sunday
Sunny, with a high near 63.
Sunday Night
Partly cloudy, with a low around 35.
M.L.King Day
Mostly sunny, with a high near 61.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
11:06 pm CST Jan 12, 2026
Forecast Valid:
11pm CST Jan 12, 2026-6pm CST Jan 19, 2026
 
Forecast Discussion
 
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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