Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Mostly Cloudy
69°F
21°C
| Humidity | 96% |
| Wind Speed | S 5 mph |
| Barometer | 29.86 in (1010.4 mb) |
| Dewpoint | 68°F (20°C) |
| Visibility | 10.00 mi |
| Last update | 18 Apr 7:56 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. Southwest wind 10 to 15 mph becoming north 15 to 20 mph in the afternoon. Winds could gust 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
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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)
7:34 am CDT Apr 18, 2026
8am CDT Apr 18, 2026-6pm CDT Apr 24, 2026
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