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Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Fair
86°F
30°C
| Humidity | 70% |
| Wind Speed | Vrbl 7 mph |
| Barometer | 30.15 in (1019.9 mb) |
| Dewpoint | 75°F (24°C) |
| Visibility | 10.00 mi |
| Heat Index | 95°F (35°C) |
| Last update | 17 Aug 9:56 am CDT |
Extended Forecast for
San Marcos TX
Today

High: 100 °F
Hot
Tonight

Low: 76 °F
Mostly Clear
Tuesday

High: 99 °F
Hot
Tuesday Night

Low: 77 °F
Mostly Clear
Wednesday

High: 99 °F
Hot
Wednesday Night

Low: 76 °F
Mostly Clear
Thursday

High: 100 °F
Hot
Thursday Night

Low: 77 °F
Mostly Clear
Friday

High: 100 °F
Hot
Detailed Forecast
Today
Sunny and hot, with a high near 100. Southwest wind around 5 mph becoming south southeast in the afternoon.
Tonight
Mostly clear, with a low around 76. South southeast wind 5 to 10 mph.
Tuesday
Sunny and hot, with a high near 99. Heat index values as high as 102. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 77. South wind around 5 mph.
Wednesday
Sunny and hot, with a high near 99. South southwest wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Sunny and hot, with a high near 100. South wind around 5 mph.
Thursday Night
Mostly clear, with a low around 77. South southeast wind 5 to 10 mph.
Friday
Sunny and hot, with a high near 100. South southwest wind around 5 mph.
Friday Night
Mostly clear, with a low around 77.
Saturday
Sunny and hot, with a high near 100.
Saturday Night
Mostly clear, with a low around 77.
Sunday
Sunny and hot, with a high near 100.
Additional Forecasts and Information
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ABOUT 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)
6:42 am CDT Aug 17, 2026
9am CDT Aug 17, 2026-6pm CDT Aug 23, 2026


