News Headlines
Hazardous Weather Conditions
Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Fair
86°F
30°C
| Humidity | 53% |
| Wind Speed | S 9 mph |
| Barometer | 30.02 in (1015.7 mb) |
| Dewpoint | 67°F (19°C) |
| Visibility | 10.00 mi |
| Heat Index | 89°F (32°C) |
| Last update | 24 Aug 10:56 pm CDT |
Extended Forecast for
San Marcos TX
Heat Advisory August 24, 11:19pm until August 26, 07:00pm
NOW until 7:00pm Wed
Heat Advisory
Tonight
Low: 75 °F
Mostly Clear
Tuesday
High: 102 °F
Hot
Tuesday Night
Low: 76 °F
Mostly Clear
Wednesday
High: 102 °F
Hot
Wednesday Night
Low: 79 °F
Partly Cloudy
Thursday
High: 101 °F
Mostly Sunny
then Slight
Chance
T-stormsThursday Night
Low: 77 °F
Slight Chance
T-stormsFriday
High: 99 °F
Mostly Sunny
then Slight
Chance
T-storms
Detailed Forecast
Tonight
Mostly clear, with a low around 75. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
Sunny and hot, with a high near 102. South wind around 5 mph.
Tuesday Night
Mostly clear, with a low around 76. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny and hot, with a high near 102. Heat index values as high as 106. Southwest wind around 5 mph becoming calm in the morning.
Wednesday Night
Partly cloudy, with a low around 79. South wind around 5 mph.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 101. Southwest wind around 5 mph becoming calm in the morning.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 77. South southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 99. Calm wind becoming east southeast around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 77. East southeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 98.
Saturday Night
Mostly clear, with a low around 76.
Sunday
Sunny, with a high near 98.
Sunday Night
Mostly clear, with a low around 76.
Monday
Mostly sunny, with a high near 98.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT 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)
7:44 pm CDT Aug 24, 2026
11pm CDT Aug 24, 2026-6pm CDT Aug 31, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
