Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Overcast
70°F
21°C
| Humidity | 90% |
| Wind Speed | S 3 mph |
| Barometer | 29.84 in (1009.6 mb) |
| Dewpoint | 67°F (19°C) |
| Visibility | 10.00 mi |
| Last update | 18 Apr 4:56 am CDT |
Extended Forecast for
3 Miles WSW San Marcos TX
Today

High: 73 °F⇓
Showers
LikelyTonight

Low: 53 °F
Showers
LikelySunday

High: 71 °F
Partly Sunny
Sunday Night

Low: 55 °F
Mostly Cloudy
Monday

High: 67 °F
Chance
T-stormsMonday Night

Low: 57 °F
Chance
T-stormsTuesday

High: 71 °F
Chance
T-stormsTuesday Night

Low: 63 °F
Slight Chance
T-stormsWednesday

High: 81 °F
Chance
T-storms
Detailed Forecast
Today
A chance of showers and thunderstorms between 7am and 4pm, then showers likely and possibly a thunderstorm after 4pm. Cloudy, with a temperature rising to near 73 by 10am, then falling to around 65 during the remainder of the day. South wind 5 to 10 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 67. East 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 71. 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. Cloudy, with a high near 81. 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 86.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
3 Miles WSW San Marcos TX
29.86°N 97.97°W (Elev. 646 ft)
29.86°N 97.97°W (Elev. 646 ft)
5:32 am CDT Apr 18, 2026
5am CDT Apr 18, 2026-6pm CDT Apr 24, 2026


