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Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Partly Cloudy
97°F
36°C
| Humidity | 45% |
| Wind Speed | E 7 mph |
| Barometer | 29.98 in (1014.1 mb) |
| Dewpoint | 72°F (22°C) |
| Visibility | 10.00 mi |
| Heat Index | 106°F (41°C) |
| Last update | 1 Sep 1:56 pm CDT |
Extended Forecast for
3 Miles ESE San Marcos TX
This Afternoon
High: 98 °F
Mostly Sunny
Tonight
Low: 77 °F
Partly Cloudy
Wednesday
High: 99 °F
Hot
Wednesday Night
Low: 77 °F
Partly Cloudy
then Slight
Chance
T-stormsThursday
High: 99 °F
Slight Chance
T-storms then
Mostly SunnyThursday Night
Low: 76 °F
Partly Cloudy
Friday
High: 98 °F
Partly Sunny
then Slight
Chance
T-stormsFriday Night
Low: 75 °F
Partly Cloudy
Saturday
High: 97 °F
Mostly Sunny
Detailed Forecast
This Afternoon
Mostly sunny, with a high near 98. Heat index values as high as 105. Calm wind.
Tonight
Partly cloudy, with a low around 77. East southeast wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny and hot, with a high near 99. Heat index values as high as 107. Southwest wind around 5 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 77. East wind 5 to 10 mph becoming south after midnight.
Thursday
A 10 percent chance of showers and thunderstorms before 7am. Mostly sunny and hot, with a high near 99. South wind around 5 mph.
Thursday Night
Partly cloudy, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 98. Calm wind becoming south around 5 mph in the morning.
Friday Night
Partly cloudy, with a low around 75. Southeast wind 5 to 10 mph becoming light south after midnight.
Saturday
Mostly sunny, with a high near 97. Calm wind becoming south around 5 mph.
Saturday Night
Mostly clear, with a low around 75.
Sunday
Sunny, with a high near 97.
Sunday Night
Mostly clear, with a low around 76.
Labor Day
Sunny, with a high near 98.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
3 Miles ESE San Marcos TX
29.86°N 97.89°W (Elev. 597 ft)
29.86°N 97.89°W (Elev. 597 ft)
2:46 pm CDT Sep 1, 2026
2pm CDT Sep 1, 2026-6pm CDT Sep 7, 2026
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