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

77°F

25°C

Humidity 94%
Wind Speed S 5 mph
Barometer 30.01 in (1015.4 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 2 Jul 5:56 am CDT
Extended Forecast for

2 Miles WSW San Marcos TX

  • Today

    Today: Mostly sunny, with a high near 94. Light south wind becoming south southeast 5 to 10 mph in the morning.

    High: 94 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 74. South southeast wind 5 to 10 mph.

    Low: 74 °F

    Mostly Clear

  • Friday

    Friday: Mostly cloudy through mid morning, then gradual clearing, with a high near 94. Heat index values as high as 100. Light south southwest wind becoming south southeast 5 to 10 mph in the morning.

    High: 94 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 74. South southeast wind 5 to 10 mph.

    Low: 74 °F

    Mostly Clear

  • Independence Day

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

    High: 96 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 75. South southeast wind 5 to 10 mph.

    Low: 75 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 96. South southeast wind around 5 mph.

    High: 96 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 75. Southeast wind 5 to 10 mph.

    Low: 75 °F

    Partly Cloudy

  • Monday

    Monday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 94. Calm wind becoming south southeast around 5 mph in the morning. Chance of precipitation is 20%.

    High: 94 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

Detailed Forecast

Today
Mostly sunny, with a high near 94. Light south wind becoming south southeast 5 to 10 mph in the morning.
Tonight
Mostly clear, with a low around 74. South southeast wind 5 to 10 mph.
Friday
Mostly cloudy through mid morning, then gradual clearing, with a high near 94. Heat index values as high as 100. Light south southwest wind becoming south southeast 5 to 10 mph in the morning.
Friday Night
Mostly clear, with a low around 74. South southeast wind 5 to 10 mph.
Independence Day
Mostly sunny, with a high near 96. South southeast wind around 5 mph.
Saturday Night
Partly cloudy, with a low around 75. South southeast wind 5 to 10 mph.
Sunday
Mostly sunny, with a high near 96. South southeast wind around 5 mph.
Sunday Night
Partly cloudy, with a low around 75. Southeast wind 5 to 10 mph.
Monday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 94. Calm wind becoming south southeast around 5 mph in the morning. Chance of precipitation is 20%.
Monday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 74.
Tuesday
Mostly sunny, with a high near 95.
Tuesday Night
Mostly clear, with a low around 76.
Wednesday
Mostly sunny, with a high near 97.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW San Marcos TX
 29.86°N 97.97°W (Elev. 646 ft)
Last Update:
5:33 am CDT Jul 2, 2026
Forecast Valid:
6am CDT Jul 2, 2026-6pm CDT Jul 8, 2026
 
Forecast Discussion
 
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Additional Resources

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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