Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Overcast
71°F
22°C
| Humidity | 94% |
| Wind Speed | N 6 mph |
| Barometer | 29.93 in (1012.9 mb) |
| Dewpoint | 69°F (21°C) |
| Visibility | 10.00 mi |
| Last update | 18 Apr 8:56 am CDT |
Extended Forecast for
San Marcos TX
Today
High: 72 °F⇓
Showers
LikelyTonight
Low: 53 °F
Showers
LikelySunday
High: 71 °F
Partly Sunny
Sunday Night
Low: 55 °F
Mostly Cloudy
Monday
High: 66 °F
Chance
ShowersMonday Night
Low: 57 °F
Chance
T-stormsTuesday
High: 70 °F
Chance
T-stormsTuesday Night
Low: 63 °F
Slight Chance
T-stormsWednesday
High: 80 °F
Chance
T-storms
Detailed Forecast
Today
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4pm. Cloudy, with a temperature falling to around 61 by 5pm. North wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 53. North northeast wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Partly sunny, with a high near 71. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly cloudy, with a low around 55. East wind around 5 mph becoming calm in the evening.
Monday
A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 66. Northeast wind around 5 mph.
Monday Night
A 50 percent chance of showers and thunderstorms. Cloudy, with a low around 57. East wind around 5 mph.
Tuesday
A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 70. East wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
A 20 percent chance of showers and thunderstorms before 1am. Cloudy, with a low around 63. Southeast wind 5 to 10 mph.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 80. Southeast wind 5 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 67.
Thursday
Mostly cloudy, with a high near 84.
Thursday Night
Mostly cloudy, with a low around 68.
Friday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85.
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)
8:42 am CDT Apr 18, 2026
9am CDT Apr 18, 2026-6pm CDT Apr 24, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
