Heavy Lake Effect Snow Downwind of Lakes Erie and Ontario; Fire Weather Concerns in the Southern Plains and Southeast
A multi-day heavy lake effect snow event is expected downwind of Lakes Erie and Ontario through New Year's Day. There is increasing confidence in snow squalls causing bursts of snow & gusty winds on New Year's Eve. Elevated fire weather conditions will continue today over parts of the Southern Plains and across much of the Southeast U.S. Read More >
Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Fair
41°F
5°C
| Humidity | 38% |
| Wind Speed | N 7 mph |
| Barometer | 30.54 in (1034.4 mb) |
| Dewpoint | 17°F (-8°C) |
| Visibility | 10.00 mi |
| Wind Chill | 36°F (2°C) |
| Last update | 30 Dec 6:56 am CST |
Extended Forecast for
San Marcos Municipal Airport TX
Today
High: 59 °F
Sunny
Tonight
Low: 30 °F
Mostly Clear
Wednesday
High: 68 °F
Sunny
Wednesday Night
Low: 41 °F
Partly Cloudy
New Year's Day
High: 74 °F
Partly Sunny
Thursday Night
Low: 54 °F
Partly Cloudy
Friday
High: 85 °F
Sunny
Friday Night
Low: 50 °F
Clear
Saturday
High: 76 °F
Sunny
Detailed Forecast
Today
Sunny, with a high near 59. North wind 5 to 10 mph.
Tonight
Mostly clear, with a low around 30. Calm wind becoming west around 5 mph after midnight.
Wednesday
Sunny, with a high near 68. West wind 5 to 10 mph becoming south southwest in the afternoon.
Wednesday Night
Partly cloudy, with a low around 41. Southwest wind 5 to 10 mph.
New Year's Day
Partly sunny, with a high near 74. South southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Thursday Night
Partly cloudy, with a low around 54. South southwest wind around 10 mph.
Friday
Sunny, with a high near 85. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Friday Night
Clear, with a low around 50. West wind 5 to 10 mph becoming north after midnight.
Saturday
Sunny, with a high near 76. North wind around 5 mph becoming east northeast in the afternoon.
Saturday Night
Mostly clear, with a low around 47.
Sunday
Sunny, with a high near 79.
Sunday Night
Partly cloudy, with a low around 53.
Monday
Partly sunny, with a high near 77.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
San Marcos Municipal Airport TX
29.9°N 97.86°W (Elev. 600 ft)
29.9°N 97.86°W (Elev. 600 ft)
5:42 am CST Dec 30, 2025
7am CST Dec 30, 2025-6pm CST Jan 5, 2026
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