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

Dangerous Heat in the Central and Eastern U.S.; Critical Fire Weather in the Great Basin and Southwest

Dangerous, record-breaking heat will intensify across most of the central and eastern U.S this week. Heat indices will likely exceed 100 degrees. Heat is likely to continue across the eastern U.S. through the Independence Day holiday weekend. Critical fire weather conditions will continue Tuesday across portions of the Four Corners and Great Basin, as dry conditions and gusty winds persist. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

78°F

26°C

Humidity 90%
Wind Speed S 9 mph
Barometer 30.03 in (1016.0 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 30 Jun 4:56 am CDT
Extended Forecast for

2 Miles WSW San Marcos TX

  • Today

    Today: Partly sunny, then gradually becoming sunny, with a high near 94. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 94 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 75. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly sunny, with a high near 94. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 94 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 74. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 95. Light south wind becoming south southeast 5 to 10 mph in the morning.

    High: 95 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.

    Low: 75 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 95. Calm wind becoming south southeast around 5 mph in the morning.

    High: 95 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.

    Low: 75 °F

    Mostly Clear

  • Independence Day

    Independence Day: Mostly sunny, with a high near 96. South wind 5 to 10 mph.

    High: 96 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, then gradually becoming sunny, with a high near 94. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tonight
Increasing clouds, with a low around 75. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 94. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 74. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny, with a high near 95. Light south wind becoming south southeast 5 to 10 mph in the morning.
Thursday Night
Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.
Friday
Mostly sunny, with a high near 95. Calm wind becoming south southeast around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.
Independence Day
Mostly sunny, with a high near 96. South wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 75.
Sunday
Mostly sunny, with a high near 96.
Sunday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Monday
Mostly sunny, with a high near 95.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW San Marcos TX
 29.86°N 97.97°W (Elev. 646 ft)
Last Update:
5:32 am CDT Jun 30, 2026
Forecast Valid:
5am CDT Jun 30, 2026-6pm CDT Jul 6, 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