Alamo Weather Forecast

    • 65
    • 80

    Increasing Clouds

    • 64
    • 80

    Partly Sunny

    • 62
    • 79

    Partly Sunny

    • 63
    • 82

    Partly Sunny

    • 62
    • 82

    Mostly Cloudy

    • 45
    • 73

    Mostly Cloudy

Today 23 Dec Hays

Partly cloudy. Highs in the upper 70s. South Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 23 Dec Hays

Partly cloudy in the Evening, then becoming mostly cloudy. Patchy fog after midnight. Lows in the lower 60s. South Winds around 5 Mph.

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Alamo Temperature Statistics

December Temperature

San Marcos, San Marcos Municipal Airport (5 miles)

  • Lowest 9 December, 2025

    28 °F

  • Average December

    53.9 °F

  • Highest 13 December, 2025

    80.1 °F

Climate (2020–Present)

San Marcos, San Marcos Municipal Airport (5 miles)

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  • Average Low 2020–2025

    59.5 °F

  • Average 2020–2025

    70.2 °F

  • Average High 2020–2025

    81.8 °F
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