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

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

81°F

27°C

Humidity 88%
Wind Speed S 12 mph
Barometer 30.12 in (1019.0 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 15 Aug 3:56 am CDT
Extended Forecast for

2 Miles NE San Marcos TX

  • Today

    Today: Mostly sunny and hot, with a high near 99. Heat index values as high as 106. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 99 °F

    Hot

  • Tonight

    Tonight: Increasing clouds, with a low around 75. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy through mid morning, then gradual clearing and hot, with a high near 100. Heat index values as high as 103. Calm wind becoming south southeast around 5 mph in the morning.

    High: 100 °F

    Hot

  • Sunday Night

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

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 100. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 100 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. South southeast wind around 5 mph.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 100. South southwest wind around 5 mph.

    High: 100 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 77. South wind 5 to 10 mph.

    Low: 77 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 101. South southwest wind 5 to 10 mph.

    High: 101 °F

    Hot

Detailed Forecast

Today
Mostly sunny and hot, with a high near 99. Heat index values as high as 106. South 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 10 mph, with gusts as high as 20 mph.
Sunday
Mostly cloudy through mid morning, then gradual clearing and hot, with a high near 100. Heat index values as high as 103. Calm wind becoming south southeast around 5 mph in the morning.
Sunday Night
Mostly clear, with a low around 75. South southeast wind 5 to 10 mph.
Monday
Sunny and hot, with a high near 100. Calm wind becoming south southeast around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 77. South southeast wind around 5 mph.
Tuesday
Sunny and hot, with a high near 100. South southwest wind around 5 mph.
Tuesday Night
Mostly clear, with a low around 77. South wind 5 to 10 mph.
Wednesday
Sunny and hot, with a high near 101. South southwest wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
Mostly sunny and hot, with a high near 101.
Thursday Night
Mostly clear, with a low around 76.
Friday
Mostly sunny and hot, with a high near 101.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NE San Marcos TX
 29.9°N 97.91°W (Elev. 640 ft)
Last Update:
2:42 am CDT Aug 15, 2026
Forecast Valid:
4am CDT Aug 15, 2026-6pm CDT Aug 21, 2026
 
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Additional Resources

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