Arnold Weather Forecast

    • 57
    • 90

    Slight Chance Thunderstorms

    • 57
    • 86

    Mostly Cloudy

    • 57
    • 90

    Partly Sunny

    • 53
    • 86

    Mostly Sunny

    • 51
    • 81

    Mostly Sunny

    • 51
    • 82

    Mostly Sunny

Today 19 Jul Northwestern Interior Mendocino

Partly cloudy until early afternoon then becoming mostly cloudy. Patchy valley fog in the morning. Highs 87 to 102.

Tonight 19 Jul Northwestern Interior Mendocino

Cloudy. Slight chance of Showers and Thunderstorms. Lows 58 to 68.

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Arnold Temperature Statistics

July Temperature

Ukiah Municipal Airport (28.6 miles)

  • Lowest 8 July, 2026

    51.7 °F

  • Average July

    75.9 °F

  • Highest 13 July, 2026

    102.7 °F

Climate (2021–2026)

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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