Arnold Weather Forecast

    • 39
    • 60

    Decreasing Clouds

    • 39
    • 63

    Partly Sunny

    • 43
    • 63

    Partly Sunny

    • 43
    • 64

    Partly Sunny

    • 41
    • 67

    Mostly Sunny

    • 40
    • 69

    Mostly Sunny

Today 7 Dec Northwestern Mendocino Interior

Mostly cloudy then becoming partly cloudy in the late morning and early afternoon then becoming mostly cloudy. Highs 53 to 65.

Tonight 7 Dec Northwestern Mendocino Interior

Partly cloudy. Patchy valley fog. Lows 36 to 46.

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Arnold Temperature Statistics

December Temperature

Ukiah Municipal Airport (28.6 miles)

  • Lowest 4 December, 2025

    34 °F

  • Average December

    46.2 °F

  • Highest 2 December, 2025

    64 °F

Climate (2020–Present)

Ukiah Municipal Airport (28.6 miles)

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  • Average Low 2020–2025

    47 °F

  • Average 2020–2025

    60.7 °F

  • Average High 2020–2025

    76 °F
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