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Hazardous Weather Conditions
Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Fair
97°F
36°C
| Humidity | 43% |
| Wind Speed | SW 12 mph |
| Barometer | 29.86 in (1010.2 mb) |
| Dewpoint | 71°F (22°C) |
| Visibility | 10.00 mi |
| Heat Index | 105°F (41°C) |
| Last update | 27 Aug 4:56 pm CDT |
Extended Forecast for
4 Miles NW San Marcos Municipal Airport TX
Heat Advisory August 27, 05:15pm until August 27, 07:00pm
NOW until 7:00pm Thu
Heat Advisory
This Afternoon
High: 101 °F
Chance
T-stormsTonight
Low: 76 °F
Chance
T-storms then
Slight Chance
ShowersFriday
High: 100 °F
Hot
Friday Night
Low: 76 °F
Mostly Clear
Saturday
High: 99 °F
Hot
Saturday Night
Low: 75 °F
Mostly Clear
Sunday
High: 99 °F
Hot
Sunday Night
Low: 74 °F
Clear
Detailed Forecast
This Afternoon
A 50 percent chance of showers and thunderstorms. Partly sunny and hot, with a high near 101. Heat index values as high as 108. West northwest wind around 5 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 76. South southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Friday
Sunny and hot, with a high near 100. Heat index values as high as 109. Calm wind becoming east around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 76. East southeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny and hot, with a high near 99. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 75. East southeast wind around 5 mph becoming south after midnight.
Sunday
Sunny and hot, with a high near 99. South wind around 5 mph.
Sunday Night
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.
Tuesday
Mostly sunny and hot, with a high near 99.
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
Sunny and hot, with a high near 99.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
4 Miles NW San Marcos Municipal Airport TX
29.95°N 97.92°W (Elev. 748 ft)
29.95°N 97.92°W (Elev. 748 ft)
2:46 pm CDT Aug 27, 2026
5pm CDT Aug 27, 2026-6pm CDT Sep 3, 2026
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