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Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Mostly Cloudy
78°F
26°C
| Humidity | 87% |
| Wind Speed | SE 6 mph |
| Barometer | 30.03 in (1016.0 mb) |
| Dewpoint | 74°F (23°C) |
| Visibility | 10.00 mi |
| Heat Index | 80°F (27°C) |
| Last update | 19 Jul 12:56 am CDT |
Extended Forecast for
San Marcos TX
Overnight
Low: 75 °F
Mostly Cloudy
Sunday
High: 93 °F
Decreasing
CloudsSunday Night
Low: 72 °F
Mostly Clear
Monday
High: 94 °F
Sunny
Monday Night
Low: 70 °F
Clear
Tuesday
High: 95 °F
Sunny
Tuesday Night
Low: 72 °F
Clear
Wednesday
High: 96 °F
Sunny
Wednesday Night
Low: 76 °F
Mostly Clear
Detailed Forecast
Overnight
Mostly cloudy, with a low around 75. South wind around 5 mph.
Sunday
Mostly cloudy, then gradually becoming sunny, with a high near 93. Heat index values as high as 100. South wind around 5 mph.
Sunday Night
Mostly clear, with a low around 72. Southeast wind 5 to 10 mph.
Monday
Sunny, with a high near 94. South wind around 5 mph.
Monday Night
Clear, with a low around 70. South southeast wind around 5 mph.
Tuesday
Sunny, with a high near 95. South wind around 5 mph.
Tuesday Night
Clear, with a low around 72. South wind around 5 mph becoming calm.
Wednesday
Sunny, with a high near 96. Calm wind becoming south southeast around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 76. Southeast wind around 5 mph becoming calm.
Thursday
Sunny, with a high near 97.
Thursday Night
Mostly clear, with a low around 77.
Friday
Sunny, with a high near 97.
Friday Night
Mostly clear, with a low around 77.
Saturday
Sunny, with a high near 96.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
San Marcos TX
29.88°N 97.94°W (Elev. 577 ft)
29.88°N 97.94°W (Elev. 577 ft)
12:46 am CDT Jul 19, 2026
1am CDT Jul 19, 2026-6pm CDT Jul 25, 2026
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