Arnold Weather Forecast

    • 50
    • 82

    Becoming Sunny

    • 53
    • 87

    Sunny

    • 49
    • 84

    Sunny

    • 47
    • 77

    Patchy Fog

    • 46
    • 76

    Mostly Sunny

    • 44
    • 73

    Mostly Sunny

Today 20 May Northwestern Mendocino Interior

Partly cloudy early in the morning then clearing. Highs 76 to 91.

Tonight 20 May Northwestern Mendocino Interior

Mostly clear. Lows 48 to 58.

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Arnold Temperature Statistics

May Temperature

Ukiah Municipal Airport (28.6 miles)

  • Lowest 8 May, 2026

    46.7 °F

  • Average May

    65.5 °F

  • Highest 11 May, 2026

    94.6 °F

Climate (2021–Present)

Ukiah Municipal Airport (28.6 miles)

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  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    61 °F

  • Average High 2021–2026

    76.2 °F
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