Mountain City Weather Forecast

    • 53
    • 61

    Cloudy

    • 60
    • 68

    Slight Chance Thunderstorms

    • 43
    • 77

    Mostly Sunny

    • 50
    • 68

    Mostly Sunny

    • 57
    • 77

    Partly Sunny

    • 56
    • 79

    Partly Sunny

Today 16 Dec Hays

Cloudy. Highs in the lower 60s. South Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 16 Dec Hays

Cloudy and not as cool. Near steady temperature in the lower 40s. South Winds around 5 Mph.

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Mountain City Temperature Statistics

December Temperature

San Marcos, San Marcos Municipal Airport (9.9 miles)

  • Lowest 9 December, 2025

    28 °F

  • Average December

    53 °F

  • Highest 13 December, 2025

    80.1 °F

Climate (2020–Present)

San Marcos, San Marcos Municipal Airport (9.9 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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