National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

85°F

29°C

Humidity 70%
Wind Speed NE 10 mph
Barometer 29.95 in (1013.2 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 23 Jul 8:56 am CDT
Extended Forecast for

10 Miles E Blanco TX

Heat Advisory July 23, 09:15am until July 23, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 23, 09:15am until July 23, 08:00pm

    NOW until 8:00pm Thu

    Heat Advisory

  • Today

    High: 97 °F

    Sunny

  • Tonight

    Tonight: A 20 percent chance of showers after 1am. Increasing clouds, with a low around 75. Breezy, with an east northeast wind 5 to 15 mph increasing to 15 to 25 mph after midnight. Winds could gust as high as 30 mph.

    Low: 75 °F

    Mostly Clear
    then Slight
    Chance
    Showers and
    Breezy

  • Friday

    Friday: Mostly sunny, with a high near 92. East northeast wind 10 to 15 mph becoming south in the morning. Winds could gust as high as 25 mph.

    High: 92 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 73. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 93. South wind around 10 mph, with gusts as high as 20 mph.

    High: 93 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 71. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 71 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 93. South wind 5 to 10 mph.

    High: 93 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 72. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 72 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 97. Heat index values as high as 100. Northeast wind 5 to 10 mph, with gusts as high as 25 mph.
Tonight
A 20 percent chance of showers after 1am. Increasing clouds, with a low around 75. Breezy, with an east northeast wind 5 to 15 mph increasing to 15 to 25 mph after midnight. Winds could gust as high as 30 mph.
Friday
Mostly sunny, with a high near 92. East northeast wind 10 to 15 mph becoming south in the morning. Winds could gust as high as 25 mph.
Friday Night
Mostly clear, with a low around 73. South southeast wind around 10 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 93. South wind around 10 mph, with gusts as high as 20 mph.
Saturday Night
Mostly clear, with a low around 71. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 93. South wind 5 to 10 mph.
Sunday Night
Mostly clear, with a low around 72. South wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 94. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 73.
Tuesday
Sunny, with a high near 95.
Tuesday Night
Mostly clear, with a low around 73.
Wednesday
Sunny, with a high near 96.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
10 Miles E Blanco TX
 30.12°N 98.26°W (Elev. 1532 ft)
Last Update:
6:42 am CDT Jul 23, 2026
Forecast Valid:
9am CDT Jul 23, 2026-6pm CDT Jul 29, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation