San Marcos Weather Forecast

    • 48
    • 67

    Sunny

    • 54
    • 77

    Mostly Sunny

    • 56
    • 75

    Partly Sunny

    • 63
    • 78

    Mostly Cloudy

    • 61
    • 79

    Mostly Cloudy

    • 60
    • 78

    Partly Sunny

Today 19 Dec Hays

Sunny, cooler with Highs in the mid 60s. East Winds 5 to 10 Mph, becoming south with Gusts up to 20 Mph in the afternoon.

Tonight 19 Dec Hays

Clear. Lows in the upper 40s. South Winds 5 to 10 Mph with Gusts up to 25 Mph.

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San Marcos Temperature Statistics

December Temperature

San Marcos, San Marcos Municipal Airport (4.3 miles)

  • Lowest 9 December, 2025

    28 °F

  • Average December

    52 °F

  • Highest 13 December, 2025

    80.1 °F

Climate (2020–Present)

San Marcos, San Marcos Municipal Airport (4.3 miles)

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  • Average Low 2020–2025

    59.4 °F

  • Average 2020–2025

    70.2 °F

  • Average High 2020–2025

    81.8 °F
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