Arnold Weather Forecast

    • 44
    • 70

    Chance Rain Showers

    • 45
    • 65

    Rain Likely

    • 42
    • 61

    Rain Showers Likely

    • 37
    • 54

    Chance Rain

    • 34
    • 55

    Chance Rain

    • 36
    • 64

    Partly Sunny

Today 8 Apr Northwestern Mendocino Interior

Sunny in the morning then becoming partly cloudy. Patchy valley fog in the morning. Slight chance of rain Showers in the afternoon. Highs 65 to 78.

Tonight 8 Apr Northwestern Mendocino Interior

Partly cloudy. Patchy valley fog. Slight chance of rain Showers. Lows 42 to 52.

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Arnold Temperature Statistics

April Temperature

Ukiah Municipal Airport (28.6 miles)

  • Lowest 3 April, 2026

    36.6 °F

  • Average April

    56.9 °F

  • Highest 5 April, 2026

    82.9 °F

Climate (2021–Present)

Ukiah Municipal Airport (28.6 miles)

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  • Average Low 2021–2026

    47.1 °F

  • Average 2021–2026

    61 °F

  • Average High 2021–2026

    76.4 °F
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