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

Tracking Weekend Storm Impacts

A storm and trailing cold front will continue to slowly move through the Gulf Coast and Southeast U.S. through this weekend with widespread rain showers and isolated thunderstorms. A fast-moving clipper storm may bring several inches of snow to the north-central Plains, Midwest, eastern Great Lakes, and Northeast regions this weekend. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

50°F

10°C

Humidity 77%
Wind Speed SE 8 mph
Barometer 29.99 in (1015.5 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 5 Dec 5:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. Southwest wind around 5 mph.

    Low: 45 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy through mid morning, then gradual clearing, with a high near 75. Southwest wind around 5 mph.

    High: 75 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 52. South southwest wind around 5 mph.

    Low: 52 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 72. West wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph.

    High: 72 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39. North wind around 10 mph, with gusts as high as 20 mph.

    Low: 39 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 62. North wind 5 to 10 mph becoming east in the afternoon.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 36. East wind around 5 mph becoming calm in the evening.

    Low: 36 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 67. Calm wind becoming south around 5 mph in the afternoon.

    High: 67 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 47. South wind around 5 mph.

    Low: 47 °F

    Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 45. Southwest wind around 5 mph.
Saturday
Mostly cloudy through mid morning, then gradual clearing, with a high near 75. Southwest wind around 5 mph.
Saturday Night
Mostly clear, with a low around 52. South southwest wind around 5 mph.
Sunday
Sunny, with a high near 72. West wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph.
Sunday Night
Mostly clear, with a low around 39. North wind around 10 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 62. North wind 5 to 10 mph becoming east in the afternoon.
Monday Night
Mostly clear, with a low around 36. East wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 67. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
Clear, with a low around 47. South wind around 5 mph.
Wednesday
Sunny, with a high near 75.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Sunny, with a high near 75.
Thursday Night
Mostly clear, with a low around 47.
Friday
Sunny, with a high near 70.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.9°N 97.91°W (Elev. 640 ft)
Last Update:
5:42 pm CST Dec 5, 2025
Forecast Valid:
6pm CST Dec 5, 2025-6pm CST Dec 12, 2025
 
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