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78666 Weather (San Marcos, TX)

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Clear at San Marcos (78666), temperature is 73°F23°C, dew point 71°F22°C, humidity 93%. Wind direction is NW at 3 mphat 5 km/h with visibility of 10 mi16 km. Barometric pressure is 30.11 in1019 mb. Last update: 8:23 am.*
*Time is approximately 8:23 am Thu, Sep 24, 2026. Time will be within 15 minutes of current local time. San Marcos weather forecast data is updated every 15 minutes.

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San Marcos TX Weather - 9:23 am

San Marcos Weather Forecast

Weather forecast for: San Marcos TX
Last Update: 6:42 am CDT Sep 24, 2026
Today: Partly sunny, with a high near 96. Heat index values as high as 102. Calm wind becoming east around 5 mph in the afternoon.
Tonight: Mostly cloudy, with a low around 74. East wind around 5 mph becoming calm in the evening.
Friday: Mostly sunny, with a high near 96. Calm wind becoming east around 5 mph in the afternoon.
Friday Night: Partly cloudy, with a low around 72. East wind around 5 mph becoming calm in the evening.
Saturday: Partly sunny, with a high near 95. Calm wind becoming south around 5 mph.
Saturday Night: Mostly cloudy, with a low around 73. Southeast wind around 5 mph.
Sunday: Mostly sunny, with a high near 96. Calm wind becoming south around 5 mph.
Sunday Night: Partly cloudy, with a low around 73. South southeast wind around 5 mph.
Monday: Mostly sunny, with a high near 96. Calm wind becoming south around 5 mph in the morning.
Monday Night: Partly cloudy, with a low around 74.
Tuesday: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 96.
Tuesday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73.
Wednesday: A 50 percent chance of showers. Partly sunny, with a high near 90.

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