Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Fair
71°F
22°C
| Humidity | 90% |
| Wind Speed | Calm |
| Barometer | 29.98 in (1014.4 mb) |
| Dewpoint | 68°F (20°C) |
| Visibility | 10.00 mi |
| Last update | 22 Sep 4:56 am CDT |
Extended Forecast for
3 Miles WNW San Marcos TX
Today
High: 98 °F
Sunny then
Slight Chance
T-stormsTonight
Low: 73 °F
Slight Chance
T-storms then
Partly CloudyWednesday
High: 98 °F
Mostly Sunny
then Slight
Chance
T-stormsWednesday Night
Low: 74 °F
Slight Chance
T-storms then
Partly CloudyThursday
High: 97 °F
Mostly Sunny
Thursday Night
Low: 72 °F
Mostly Cloudy
Friday
High: 97 °F
Mostly Sunny
Friday Night
Low: 71 °F
Partly Cloudy
Saturday
High: 97 °F
Mostly Sunny
Detailed Forecast
Today
A 20 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 98. Heat index values as high as 103. Calm wind becoming east around 5 mph in the afternoon.
Tonight
A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 73. East wind around 5 mph becoming calm in the evening.
Wednesday
A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 98. Heat index values as high as 104. Calm wind becoming east northeast around 5 mph in the afternoon.
Wednesday Night
A 10 percent chance of showers and thunderstorms before 7pm. 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. Calm wind becoming east around 5 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 72. East wind around 5 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 97. Calm wind becoming east southeast around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 71. East southeast wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 97. Calm wind becoming south southeast around 5 mph.
Saturday Night
Partly cloudy, with a low around 72.
Sunday
Mostly sunny, with a high near 97.
Sunday Night
Partly cloudy, with a low around 73.
Monday
Mostly sunny, with a high near 95.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
3 Miles WNW San Marcos TX
29.9°N 97.97°W (Elev. 686 ft)
29.9°N 97.97°W (Elev. 686 ft)
5:32 am CDT Sep 22, 2026
6am CDT Sep 22, 2026-6pm CDT Sep 28, 2026
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