Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Mostly Cloudy
97°F
36°C
| Humidity | 39% |
| Wind Speed | Vrbl 3 mph |
| Barometer | 29.89 in (1011.0 mb) |
| Dewpoint | 68°F (20°C) |
| Visibility | 10.00 mi |
| Heat Index | 102°F (39°C) |
| Last update | 20 Sep 2:56 pm CDT |
Extended Forecast for
4 Miles NNW San Marcos Municipal Airport TX
This Afternoon
High: 98 °F
Partly Sunny
Tonight
Low: 74 °F
Mostly Cloudy
Monday
High: 98 °F
Becoming
SunnyMonday Night
Low: 74 °F
Partly Cloudy
Tuesday
High: 98 °F
Mostly Sunny
Tuesday Night
Low: 74 °F
Slight Chance
T-storms then
Slight Chance
ShowersWednesday
High: 97 °F
Mostly Sunny
Wednesday Night
Low: 74 °F
Partly Cloudy
Thursday
High: 97 °F
Mostly Sunny
Detailed Forecast
This Afternoon
Partly sunny, with a high near 98. Heat index values as high as 104. South southeast wind around 5 mph.
Tonight
Mostly cloudy, with a low around 74. South southeast wind around 5 mph.
Monday
Partly sunny, then gradually becoming sunny, with a high near 98. Heat index values as high as 104. Calm wind becoming southeast around 5 mph.
Monday Night
Partly cloudy, with a low around 74. East northeast wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 98. Calm wind becoming east around 5 mph in the afternoon.
Tuesday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 74. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 97. Calm wind becoming east around 5 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 74. East wind around 5 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 97. Light north northeast wind becoming east 5 to 10 mph in the morning.
Thursday Night
Partly cloudy, with a low around 72.
Friday
Mostly sunny, with a high near 95.
Friday Night
Partly cloudy, with a low around 72.
Saturday
Mostly sunny, with a high near 96.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
4 Miles NNW San Marcos Municipal Airport TX
29.95°N 97.89°W (Elev. 646 ft)
29.95°N 97.89°W (Elev. 646 ft)
3:14 pm CDT Sep 20, 2026
3pm CDT Sep 20, 2026-6pm CDT Sep 26, 2026
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