Arnold Weather Forecast

    • 41
    • 62

    Increasing Clouds

    • 39
    • 60

    Mostly Cloudy

    • 36
    • 61

    Mostly Sunny

    • 34
    • 59

    Mostly Sunny

    • 33
    • 61

    Partly Sunny

    • 36
    • 57

    Mostly Cloudy

    • 37
    • 57

    Partly Sunny

Today 20 Jan Northwestern Mendocino Interior

Partly cloudy early in the morning then becoming mostly cloudy. Highs 58 to 68.

Tonight 20 Jan Northwestern Mendocino Interior

Mostly cloudy. Lows 40 to 50.

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Arnold Temperature Statistics

January Temperature

Ukiah Municipal Airport (28.6 miles)

  • Lowest 9 January, 2026

    30 °F

  • Average January

    47.3 °F

  • Highest 15 January, 2026

    70 °F

Climate (2021–Present)

Ukiah Municipal Airport (28.6 miles)

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  • Average Low 2021–2026

    47 °F

  • Average 2021–2026

    60.7 °F

  • Average High 2021–2026

    76 °F
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