Prolonged Extreme Cold; Eastern U.S. Winter Storm
Another Arctic blast will surge south across the northern Plains Thursday night, crossing the Midwest and reaching the Gulf Coast Friday night. Confidence continues to increase for significant heavy snow across much of the Southern Appalachians, Carolinas, and southern Mid-Atlantic Friday into Sunday. Read More >
Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Fair
29°F
-2°C
| Humidity | 89% |
| Wind Speed | Calm |
| Barometer | 30.17 in (1021.8 mb) |
| Dewpoint | 26°F (-3°C) |
| Visibility | 10.00 mi |
| Last update | 29 Jan 4:56 am CST |
Extended Forecast for
San Marcos TX
Today
High: 68 °F
Mostly Sunny
Tonight
Low: 35 °F
Partly Cloudy
Friday
High: 57 °F
Partly Sunny
Friday Night
Low: 29 °F
Mostly Clear
Saturday
High: 45 °F
Sunny
Saturday Night
Low: 20 °F
Mostly Clear
Sunday
High: 53 °F
Sunny
Sunday Night
Low: 32 °F
Mostly Clear
Monday
High: 61 °F
Mostly Sunny
Detailed Forecast
Today
Mostly sunny, with a high near 68. Light west southwest wind becoming south southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Tonight
Partly cloudy, with a low around 35. North wind 10 to 15 mph, with gusts as high as 20 mph.
Friday
Partly sunny, with a high near 57. North wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Mostly clear, with a low around 29. North wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 45. North northeast wind 5 to 15 mph, with gusts as high as 25 mph.
Saturday Night
Mostly clear, with a low around 20. Northeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 53. Calm wind becoming south around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 32. South wind around 5 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 61. Calm wind becoming south southeast around 5 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 48.
Tuesday
Mostly cloudy, with a high near 70.
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 49.
Wednesday
A 40 percent chance of showers. Mostly cloudy, with a high near 61.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
San Marcos TX
29.88°N 97.91°W (Elev. 597 ft)
29.88°N 97.91°W (Elev. 597 ft)
4:44 am CST Jan 29, 2026
5am CST Jan 29, 2026-6pm CST Feb 4, 2026
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