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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 | 46% |
| Wind Speed | SE 5 mph |
| Barometer | 30.04 in (1016.5 mb) |
| Dewpoint | 63°F (17°C) |
| Visibility | 10.00 mi |
| Heat Index | 87°F (31°C) |
| Last update | 16 Aug 8:56 pm CDT |
Extended Forecast for
San Marcos TX
Tonight

Low: 73 °F
Mostly Clear
Monday

High: 100 °F
Hot
Monday Night

Low: 75 °F
Mostly Clear
Tuesday

High: 99 °F
Hot
Tuesday Night

Low: 76 °F
Mostly Clear
Wednesday

High: 100 °F
Hot
Wednesday Night

Low: 76 °F
Mostly Clear
Thursday

High: 101 °F
Hot
Thursday Night

Low: 76 °F
Mostly Clear
Detailed Forecast
Tonight
Mostly clear, with a low around 73. South southeast wind 5 to 10 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Monday
Sunny and hot, with a high near 100. Southwest wind around 5 mph becoming south southeast in the afternoon.
Monday Night
Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.
Tuesday
Sunny and hot, with a high near 99. Heat index values as high as 102. South wind around 5 mph.
Tuesday Night
Mostly clear, with a low around 76. South wind around 5 mph.
Wednesday
Sunny and hot, with a high near 100. 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
Mostly sunny and hot, with a high near 101. South wind around 5 mph.
Thursday Night
Mostly clear, with a low around 76. South southeast wind 5 to 10 mph.
Friday
Sunny and hot, with a high near 100.
Friday Night
Mostly clear, with a low around 76.
Saturday
Mostly sunny and hot, with a high near 100.
Saturday Night
Mostly clear, with a low around 76.
Sunday
Sunny and hot, with a high near 99.
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 pm CDT Aug 16, 2026
9pm CDT Aug 16, 2026-6pm CDT Aug 23, 2026


