News Headlines
Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Mostly Cloudy
76°F
24°C
| Humidity | 91% |
| Wind Speed | S 3 mph |
| Barometer | 30.03 in (1015.9 mb) |
| Dewpoint | 73°F (23°C) |
| Visibility | 10.00 mi |
| Heat Index | 76°F (24°C) |
| Last update | 28 Aug 5:56 am CDT |
Extended Forecast for
3 Miles NNW San Marcos Municipal Airport TX
Today
High: 98 °F
Mostly Sunny
then Slight
Chance
T-stormsTonight
Low: 75 °F
Slight Chance
T-storms then
Mostly ClearSaturday
High: 98 °F
Sunny
Saturday Night
Low: 74 °F
Mostly Clear
Sunday
High: 98 °F
Sunny
Sunday Night
Low: 74 °F
Mostly Clear
Monday
High: 98 °F
Sunny
Monday Night
Low: 75 °F
Mostly Clear
Tuesday
High: 98 °F
Mostly Sunny
Detailed Forecast
Today
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 98. Heat index values as high as 105. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 20%.
Tonight
A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 10pm. Mostly clear, with a low around 75. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 98. Heat index values as high as 104. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 74. Southeast wind around 5 mph becoming south southwest after midnight.
Sunday
Sunny, with a high near 98. Calm wind becoming south southeast around 5 mph in the morning.
Sunday Night
Mostly clear, with a low around 74. Southeast wind 5 to 10 mph.
Monday
Sunny, with a high near 98. South wind around 5 mph.
Monday Night
Mostly clear, with a low around 75. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 98. South wind around 5 mph.
Tuesday Night
Mostly clear, with a low around 75.
Wednesday
Mostly sunny, with a high near 98.
Wednesday Night
Mostly clear, with a low around 75.
Thursday
Mostly sunny and hot, with a high near 99.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
3 Miles NNW San Marcos Municipal Airport TX
29.95°N 97.89°W (Elev. 646 ft)
29.95°N 97.89°W (Elev. 646 ft)
6:42 am CDT Aug 28, 2026
6am CDT Aug 28, 2026-6pm CDT Sep 3, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
